For questions about the wiring of a car(apparatus that connects electrical circuits).

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16
votes
5answers
63k views

What causes battery terminal corrosion?

I put a new battery in my car about 8 months ago. After a problem starting a couple days ago, I found that there was massive corrosion under the battery terminals, so I cleaned them out and ...
12
votes
1answer
8k views

Do I have to rely on wire color to correctly wire up an O2 sensor?

It seems that everyone and their grandmother has a different color-code convention for 4-wire O2 sensors, which complicates matters when one is trying to wire up a replacement "universal" O2 sensor. ...
10
votes
1answer
178 views

How do I make all of this work together?

I have a friend with 1988 Jeep YJ. I'm not sure if this question is more appropriate for here or for Electrical Engineering. We want to mount this blender with an AC motor in it. I think it's 110 ...
10
votes
1answer
217 views

Are there downsides to making an accessory socket always live, if accessories are removed when not in use?

In some cars, the power line from the battery to the accessory outlet (aka cigarette lighter socket) is always live. In others, it's off until ignition. It seems pretty much random which cars are ...
9
votes
1answer
258 views

Motorcycle Headlight Conversion

I've decided to install a new headlight on my bike. The current setup is two bulbs, one is on for low beam and both on for high beam, with two wires going out of each (h11?). Here is a short video of ...
8
votes
5answers
29k views

Is it necessary to have two ground wires (1 to engine and 1 to car-frame)?

My jeep's stock wiring has two ground cabled coming from the negative terminal. I recently upgraded all of my positive cables, and now I'm on to the negative. Is it necessary to have one cable going ...
8
votes
1answer
67 views

Testing specific wires in harness cable

I want to do some electrical mods like adding a push/pull switch to my truck' tailgate to wire into my door ajar light to let me know if it is open along with splicing an electrical tailgate lock into ...
8
votes
1answer
122 views

Disconnected wires near battery in BMW e46

I noticed a disconnected wire dangling next to the battery in the trunk of my 2005 BMW 330ci. It was actually a red and blue wire that veered off from the thick red one in the middle of the image. ...
7
votes
4answers
4k views

1997 Dodge Grand Caravan not starting, mystery wires?

1997 Dodge GC with 180k miles, has been sitting for maybe 6 months after being driven a little, and now it won't start. cranks fine, all electronics work, but doesn't fire. I checked there is fuel ...
7
votes
0answers
272 views

GPS dashboard mount replacement?

When I bought my car, they were doing a promo and shipping a Garmin GPS with it. Thing is, the GPS came with a nice mount, fixed to the dashboard. This was great, because it meant no wires going ...
6
votes
3answers
3k views

How to amplify car speakers without stereo?

I have a 1980 VW Dasher with its original speakers but no radio. It has an unusual (erroneous?) electrical configuration where most accessories (e.g. lights, cabin fan, etc) still run even with the ...
6
votes
2answers
77 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 ...
6
votes
1answer
128 views

Why do cars still use mechanical blinker relays?

I think the electronic relays may be cheaper; and having less moving parts they are theoretically less prone to break. So, why do cars still use mechanical relays for turning lights?
6
votes
1answer
72 views

Where can I find a power adapter to run a car stereo from a wall outlet?

I have a car stereo head unit that I'd like to repurpose as a radio for my garage. Given that, I'm looking for some kind of power adapter / transformer that I can plug into a wall outlet and splice ...
5
votes
4answers
79 views

Modding Honda Ridgeline cigarette lighter to power USB ports

I am doing a project in my '06 Ridgeline where I am taking out the iPod / Aux add-on and putting in a Bluetooth / Aux add-on at the back of the radio. In the process I will be removing the left ...
5
votes
3answers
2k views

How do I diagnose opened door indicator problem on a Honda Civic 1.8Vti Aerodeck

The opened door light indicator flashes at random rate when I drive. This also randomly triggers the alarm system that I had to disconnect. I have removed every door switches. No differences. ...
5
votes
2answers
459 views

What is this? Hanging out of my wiring, with yellow wrapping - a testing port maybe?

Can you explain what this yellow thing is?
5
votes
2answers
18k views

Peugeot 206 LX (2002), I have installed a cd player which works but it doesn't remember volume/clock settings

I have installed a new CD player Philips CEM2100 it works but when I turn the car on and off it loses several settings such as: Volume, eu region for radio (this may be because I haven't fitted the ...
5
votes
2answers
7k views

Manual horn switch

what are the pitfalls or things to look out for when manually wiring a switch from the battery to the horn? Some background: I just moved to texas where they require vehicle inspections. My horn ...
5
votes
1answer
27 views

Replacement: How do I determine what wiring harness goes with my headlight?

I have a 2005 scion xB and am needing to replace the headlights and one of the wiring harnesses. I have seen on places like amazon and other sites for OE head lights, but I cannot seem to find ...
5
votes
1answer
50 views

Replacing a very old radio by a slightly less old one

I have an old Daewoo car (from 1995) with a non working stock radio unit (a Philips DC508D). I got a "slightly less old" Pioneer DEH-2000R (from 1998) as a replacement. None of them has any kind of ...
5
votes
1answer
87 views

Unknown red wiring harness near cooling fan area on a Ford Focus 2004

I have a 2004 Ford Focus SE DOHC. Today, I opened the hood and found an unconnected red wiring harness (shown in the picture, it's the one with a question mark pointed at). I looked around the area ...
5
votes
0answers
30 views

VW Transporter T5 - p1503 Generator Terminal DF (Load signal) Signal Improbable

I have a VW Transporter T5 2007 with 2.5 TDi BNZ engine. I have the following fault code (among many): p1503 Generator Terminal DF (Load signal) Signal Improbable. This fault code gets repeated ...
5
votes
0answers
110 views

Car Audio wiring

BMW E46 Android head unit A little context: I have a head unit, that I want to have constant power through ACC. Basically, it's an android tablet customized for my car, but the manufacturer ...
4
votes
3answers
121 views

Mini Cooper 2003 - Identify rear indicator light wiring to install LED resistor

So off the back of a previous question, I need to install a resister to my cluster in order for the LEDs in the indicators to work properly and not hyper flash. Here is an image of the wiring that I ...
4
votes
2answers
4k views

12v Acc/Switched vs 12v Always On

I am currently designing a part that should always be on when the key is turned to On/Acc, and only sometimes on when the key is set to Off, or removed. My car is a 99 Camry, but I have a good ...
4
votes
2answers
148 views

Mystery wiring harness underneath the gearshift on a 2004 Ford Focus

My Ford Focus had an evaporator core leak, so the DIY hobbyist in me took apart the instrument panel, dashboard and finally, replaced the evaporator core. I'm on my way putting parts back together. ...
4
votes
1answer
39 views

Re-wiring Harness in Jet Boat w/ Ford 460

I'm replacing the wiring harness on my jet boat. It has a Ford 460 in it. The boat has five gauges on it. A tachometer, oil pressure, amperage, fuel gauge, and water temp. There is also a toggle ...
4
votes
1answer
53 views

How to diagnose undervolt in electrical system

I have a 1980 VW Dasher. Most of the electric systems perform noticeably weakly, e.g. the A/C fan, interior lamp, dash panel backlighting, windshield wipers, and headlamps. These symptoms have been ...
4
votes
1answer
8k views

VW Mk4 Golf/GTI airbag indicator warning light

My 2002 VW GTI MkIV recently had the airbag warning indicator light turn on. The VW dealership wanted to charge around $600 to fix it. They told me the seatbelt latch was at fault because it had an ...
4
votes
3answers
295 views

Upgrading starter wire?

I did an alternator upgrade recently, and I have 3 feet of 1/0awg wire left over. Would it make any difference if I were to use this remaining wire to replace my starter's current 6awg wire? I have ...
4
votes
1answer
582 views

2014 Ford Fusion Front Speaker Replacement (Wiring Question)

I'm replacing the front door speakers in my 2014 Ford Fusion, it is the 6 speaker system(NO 8" LCD or Premium Sony Package). I'm looking at the factory wiring harness and it consists of 4 wires going ...
4
votes
1answer
2k views

Repair or replace frayed fuel injection wiring harness?

This is on a 2008 Chevy Impala, 3.5L V6, non-flexfuel. Recently got cylinder 1 misfire / ignition failure codes. An investigation revealed that mice had gotten into my garage, made themselves at ...
4
votes
4answers
301 views

Suzuki Sidekick Radio Ground Wire Location

I'm in the process of replacing the radio in my '96 Sidekick 1.8L. This ground wire was attached to the aftermarket radio that I removed (I think it was aftermarket). The ring was connected to a ...
4
votes
1answer
86 views

HuiFei Android HeadUp Unit not shutting down completely, ACC and CONST wires mixed up?

I Bought No brand Android head up unit from ebay (Hong Kong) here is a link to the unit Generic android 4.4.4 car stereo My car is Volkswagen Golf VI 2010 The problem is that when I turn the car off ...
4
votes
1answer
358 views

How long should fusible links be?

I've installed a 12" fusible link as a replacement for a fusible link on the line that charges the battery from the alternator. I showed the OEM part to the guy at the parts store and he gave me a 12" ...
4
votes
0answers
26 views

Hiace 1996 ignition/motor problems

I have a 1996 Hiace. I was driving and it just died, nothing. Dash lights all work, but motor will not turn over, nothing from starter. It has dual fuel, and was wondering if it could be the AEB 552 ...
4
votes
0answers
138 views

How to wire an ignition switch for boat throttle controller

I have an old Bass Tracker boat. They no longer make the throttle controller for the boat, but I need to replace the ignition switch (which is in the throttle controller). I looked online and this ...
3
votes
1answer
26 views

Dodge w150 318 727 torqueflite; need help with wiring

We just got done putting motor back in but a ground wire from the head to the fire wall keeps getting hot and smoking (steel braided wire) we've been all over this thing and cant find out our problem
3
votes
3answers
455 views

How can I route power cables from my 2012 Kia Forte eco from the battery to the cabin?

I have a 2012 Kia Forte sedan with "eco" package. I'd like to mount my mobile amateur radio into the vehicle, however I'm having a hard time locating a grommet for passing power leads from the cabin ...
3
votes
1answer
105 views

Cracked & frayed wire everywhere!

I have an 84 Ranger with a 2.8L V6. This car seems to have a fair amount of electrical issues, but mostly really minor. I noticed that A LOT of the wiring harness is cracked or frayed, just because ...
3
votes
2answers
1k views

Radio Wiring Harness for a 2000 Chevy Cavalier

I'm trying to locate a wiring harness for my new stereo that I want to install into my 2000 Chevy Cavalier, but I'm having a difficult time find one. Does anyone know of a after market harness that ...
3
votes
2answers
6k views

Should I connect the “power antenna” wire to the “auto antenna” wire?

I have a new radio (Clarion cx501) for my 2005 Mazda 3. I bought a special wiring harness to make the installation easier. I have two wires that I'm not sure if I must connect. They look like the same ...
3
votes
1answer
9k views

Headlights turning off randomly

I have a 95 Chevy S10. When I drive my truck around at night I notice that occasionally my headlights turn off for about 3 seconds and then come back on by themselves. There doesn't seem to be any ...
3
votes
2answers
483 views

Trailer wiring corrosion

Every couple of years I find that the trailer wiring connector (7 pin) on the back of my truck doesn't work properly, causing the brake or turn signals on the trailer to not function. This is caused ...
3
votes
1answer
35 views

Gem Harness - MAZDA 2 1.6 2011

Can someone please explain to me what is Gem Harness? Is it something to do with wiring? Searched the net but could not find any convincing answer anywhere. The primary reason I am asking is because ...
3
votes
1answer
142 views

Wiring Harness / Fuse Panel Repair

I have a 2006 Dodge Magnum and a friend of mine was changing the starter. Forgot to unhook the battery. And when the hot wire on starter grounded out it Melted the Negative battery cable until it ...
3
votes
1answer
2k views

Central Locking Help: Why are there 3 wires for each door lock?

Tl;Dr: I want my hazards to flash with the central locking. I need to wire them up together with a diode to each side (left and right). The central locking has 3 wires My questions are: Does anyone ...
3
votes
1answer
124 views

Broken tubes underneath 2000 Dodge Ram 1500

2000 Dodge Ram 1500, Laramie V8 - 5.2L While trying to figure out why the 4WD light flickers on and off (when in 2H, it is off while stopped, will come on or flicker after 15-20mph, may randomly go ...
3
votes
1answer
1k views

Help setting up Bi-Xenon lights with h4 wiring

I am doing one of the oh-so controversial HID retrofits - I got myself I nice pair of projectors and bulbs (I am using cheep ballasts until I have the money for some nice OEM ones). The projectors I ...