Questions tagged [electrical]

Concerning the main electrical system of a motor vehicle or internal combustion engine. Consider using [tag:electronics] for radios and other such systems. Use [tag:electric-vehicle] for questions about electrical powered vehicles and their unique systems.

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4answers
3k views

Considerations for soldering car battery wires?

I've had several problems with my car's wiring oxidizing at the exposed ends near and under post clamp and causing electrical connectivity problems. The braided wire is a pain to brush clean and I ...
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4answers
16k views

How do you test relays?

I have a Pontiac Grand Am. After getting a hose replaced, I noticed that my fans don't come on now. I checked the fuses and cooling fan #2's fuse is burnt out, which (I think) should be for AC only. ...
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5answers
333 views

Charging circuit

I have a motorhome and tow my car behind. Since I have to leave the car in accessory mode so the steering wheel is unlocked, the battery doesn't last a long time. I want to run a DS line from the ...
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5answers
144k views

Car won't start or stay running after a jump

I have a 2004 Kia Spectra 1.8, I have replaced the spark plugs, the alternator, and my battery is only about two months old. The car will start after a jump but it has to sit for about 10 minutes ...
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7answers
108k views

Keeping radio/stereo unit powered to save pre-set preferences?

In my previous cars I could save certain radio stations, volume levels, etc. on my stereo and they would stay saved (unless the battery went dead). I'm using the same stereo head unit in my latest ...
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3answers
973 views

Upgrade to HID lights in a Jeep Wrangler

I would like to upgrade to HID lights in my 2008 Jeep Wrangler. The stock lights aren't bright at all. My question is, since this would be an aftermarket upgrade, what am I looking at here? Is it ...
6
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4answers
25k views

Do month-year coloured dots on batteries signify install-by expiration date?

As per How do you know if the replacement battery is a good one?, it may be the case that I've purchased a battery that may not be at its best. I got it from a VW dealer installed on 2016-10-01; it ...
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4answers
8k views

What is the best overall ODB2 scan tool? [closed]

There are a number of different ODB2 scan tools out there, some PC based, some standalone units, some more for tuning and some more for diagnosing problems. What are the different features that these ...
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2answers
5k views

2004 VW Passat B5 Cigarette Lighter Broken - Common Problem

The problem I have been having with my VW Passat was that my cigarette lighter was not working in the car. It is the only one in the main part of the car (there is another one in the boot) and it ...
6
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3answers
510 views

Where is the “Black Box” in a vehicle and what does it record?

I've seen a "black box" referred to by the media in the past and again today in the reporting of the death of Aubrey McClendon. The headline on the TV said "Police retrieve the Black Box from vehicle"...
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2answers
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Writing CAN Messages

I want to know what should I write with the CAN ID to send it to ECU. I am using ELM327 and Raspberry Pi with all connections to OBD-II. Initially for sending general PIDs to the ECU through ELM327 ...
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3answers
116 views

Multiple Batteries Charging

I have multiple batteries off from motorcycles, and each of them has it's own charge level (12-13 Volt measured at rest). Assuming I have only one 12 Volt charger, can I charge them in parallel until ...
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4answers
31k views

Doors lock from fob, then unlock themselves

I have a 2002 S-Type Jaguar. When I hit the door lock button on the remote, they lock, then they all open back up in a few seconds. I can't keep them locked. What is causing this? Can anyone help me? ...
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5answers
5k views

High Beam Indicator Problem

I have a situation where I'm doing wiring for the dashboard of a vehicle. For whatever reason, the turn signal/headlight switch on this vehicle outputs a 6 volt signal on the high beam wire when the ...
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1answer
4k views

What would cause a slow drain of a battery?

Have a 2002 Toyota Camry, I got a switch to disconnect the battery, but before that the battery would slowly drain if you left the car for about a week. The solution is fine for now, but how would I ...
6
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1answer
478 views

How Common are Voltage Drop Problems?

After watching this video on voltage drop, it makes me feel like testing the resistance of various sensors and accessories with my multi-meter isn't really a reliable test of anything, since I can see ...
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2answers
4k views

Is this the correct procedure for a stator test?

Stator Test I have a 2007 DL 1000 V-Strom: I followed the following process while checking the stator: Put multimeter to VAC Tested the three phases of the stator connector plugged into a new ...
6
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1answer
268 views

Is it necessary to have the good car's engine running when jumpstarting

When jump-starting a vehicle, one first connects the positive and negative terminals between the two cars: positive to positive and negative (good battery) to a bolt head on the vehicle with the dead ...
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2answers
2k views

1999 Ford Ranger Battery Drain

I have had a slight battery drain on my Ford Ranger, enough to kill the battery after a few days of sitting. The battery is new. This is the troubleshooting I have done so far: Tested the battery ...
6
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1answer
893 views

How do I remove these electrical connectors on the inside of my drivers side door?

I have a 2004 Mazda B2300. I am pretty green at anything electrical or automotive for that matter and was trying to replace my door handle that broke off. I have almost removed the whole inner panel, ...
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1answer
254 views

Effects of shutting off Nissan altima (or any car) while in drive

Every now and then when I get home after a long day, I pull into my driveway and while the car is stopped (foot on the brake), I turn the vehicle off without putting the vehicle in "Park". Car is ...
6
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1answer
4k views

My motorcycle won't start at all why?

Something is draining my battery and my bike won't start. If it's the relays which one is it? My motorcycle doesn't crank at all. it makes a buzzy noise when I press the start button. It sounds like ...
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2answers
2k views

Is there something that can be applied to electrical connections to prevent rust and corrosion?

Another recent question got me thinking about this. Will a ground to the frame work properly if the bolt is powder-coated? Since I don't have any skill, tools, or ability to powder coat, whats the ...
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2answers
1k views

Multiple issues with AUX input (Mazda 3 2007)

I experience a bunch of problems with my 2007 Mazda 3's electrical system: The most annoying issue is that I hear [a rather loud] engine noise when I connect a phone to the AUX (3.5mm audio jack) ...
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1answer
190 views

Any reason I couldn't replace my entire fuse box with self-resetting breakers?

I'm always rewiring something or upgrading a component here or there on my vehicle. I recently discovered self-resetting breakers that can replace standard automotive fuses. This seems like a silver ...
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1answer
6k views

Should I disconnect the battery when working on my instrument cluster

I am going to be changing a few bulbs on my Opel Astra's instrument cluster. Part of the process involves disconnecting the entire cluster from the wiring harness and obviously replacing it when done. ...
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1answer
6k views

What current is “normal” for constant battery drain (not parasitic)

I'm having some problems with battery going dead sometimes, and I noticed that there are some small sparks after disconnecting the battery for a few seconds and then reconnecting again. It is not big ...
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2answers
1k views

Replace or Repair Mazda MPV 2000 faulty ECU?

I asked a question about troubleshooting ECU related short circuits. No more short circuits in the wiring harness, the only short left appears to be inside the ECU. This leaves me with a faulty ECU. ...
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2answers
444 views

Why do the batteries on some cars need to be hot-swapped?

By "hot-swap" I mean ensuring that the new battery is connected in parallel to the old battery while the old battery is removed and the new one is installed in its place. The idea is to ensure that ...
6
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1answer
2k views

I dropped my bike and now it won't start

I have a Suzuki GSX600F Katana. Yesterday, I changed the clutch lever on the handlebar and left the key on. I had to push start my bike. After getting it started, I left it in first gear, and let go ...
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2answers
122 views

Oil pressure light on when igntion is off and goes out when key is on and engine is not running

83 Mitsu PU Diesel. Oil light on drawing .25 amps when key is off. Key on the light goes out. All other lights and gauges work as they should. Light is off when the engine is running. It is ...
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2answers
2k views

Bmw E46: strange problems with automatically closing windows and broken light warning

I have had a couple of strange problems and I can't really make sense of it. When I parked the car, I locked the doors as always with the windows closed (I am absolutely sure about this; it was ...
6
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1answer
9k views

Troubleshooting ECU related short circuits

I own a vehicle that has given me a lot of grief recently due to short circuits. The benefit of this is that I have undertaken a class on professional automotive electronics diagnostics and repair ...
6
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2answers
847 views

My low beam only works when I take the high beam fuse out

I have a 2008 Honda Accord. The right low beam stopped working so I took the right high beam fuse out and the right low beam started working again but when I put the high beam fuse back and turned the ...
6
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5answers
914 views

I have a 97 toyota camry, I turn the key over everything works fine except it just clicks?

Can anyone tell me why my 1997 Toyota Camry is acting up? I'll turn the key over and it just clicks. My vents, lights, etc all work. We even tried jumping it and nothing...it just clicks. Worked ...
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4answers
6k views

What voltage does the ECU need?

I am tracing the operation of the ECU. I want to supply it with power but what is the ECU voltage input that I should supply?
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1answer
6k views

A fuse slot has disappeared

My 2003 Opel Agila has recently had a catastrophic electrical problem, and my electric mirrors do not work anymore. The recovery guy pulled out and replaced a few fuses, and I drove home all fine. ...
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3answers
3k views

Boat Not Getting Power to the Starter Motor

Just rebuilt most of a 2 stroke jet boat. ( if you need / want any boat details, see: this thread ) First day the boat started fine, no problems, next day I tried again and the CDI fuse had blown ( ...
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2answers
4k views

Motorcycle Starting Motor does not crank, WHY?

Eureka! After replacing the starter relay purchased on eBay with the original Honda one the engine starts and runs perfectly! ''''''2''''' UPDATE: installed a new fully charged battery = still no ...
6
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1answer
370 views

Help with Strange Intermittent yet predictable parasitic battery drain?

I'm having an issue where while testing circuits for the offending drain, I will see NO drain for about 30 seconds and then a 6-9 amp drain for about 10; rinse and repeat. Anybody have an idea what ...
6
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1answer
21k views

8th Gen Honda - No Start, No Crank (down the rabbit hole)

This one should be fun for any Honda aficionados out there. I have a 2007 Honda Civic. Some days it does not start or crank; seems related to the temperature. When the car starts, it runs fine and ...
6
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3answers
20k views

Daytime running light failure — one side only

I have a 1991 Miata. It's a Canadian vehicle, and so is equipped with daytime running lights. Recently, I've noticed that the passenger side light is not working as a DRL. The driver's side light ...
6
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1answer
172 views

My drivers side window no longer closes with one press of the button 1

I share a similar plight with the guy before only difference is it's with an 04 Forester STi. I held the passenger front window switch up for a little too long next thing I know my driver side window ...
6
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1answer
102 views

97 Infiniti J30 died out at stoplight, unknown electrical issue

my 1997 Infiniti J30 had the engine die at a stoplight. It turns over when I try to start it, but the engine won't start. The power windows were partly down, and they now won't go up, although the ...
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3answers
2k views

VW Golf electrics problem with door closed

I have a VW Golf 1.9 TDi 55 plate MK VI. When the door is CLOSED (with the ignition on) : The mirrors do not adjust, the windows do not open, the fuel flap does not open and the child door lock does ...
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1answer
153 views

How to Track Down an Electrical Short

In a previous question regarding my dashboard lights not working I found that the "tail" fuse would burn out immediately upon turning on the headlights. This is after someone did repairs to the horn, ...
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1answer
1k views

Vauxhall Vectra C Blower Motor Sqealing / Clunking

I have just replaced my Blower Motor Resistor as my fan wouldn't work on any setting other than 4 (in line with a previous post: How to troubleshoot a fan that won't work unless it's on it'...
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4answers
19k views

How can I put down stuck rear sunshade on a 2006 Mercedes E class?

I have a 2006 Mercedes E-350 with an automatic rear sunshade; until a week ago the sunshade worked fine, but now it's stuck up and I can't get it to come down by any means. The button to move the ...
6
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1answer
1k views

How much current should 2007 Mazda6 draw when off?

I've been finding my 2007 Mazda6 battery low in the mornings. This morning, with moderate temperatures, I had to jump it to start the engine. I put a clamp ammeter on the battery cable and pulled ...
6
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1answer
766 views

Is this a right MAF signal?

I've just bought this MAF sensor for the injection setup I'm going to build, and first I was struggling to figure out how to connect it. It's used for several BMW cars.(E38,E39,Z3) On the connector it ...