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

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7
votes
4answers
15k 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 ...
5
votes
3answers
2k 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 ...
5
votes
3answers
1k 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
299 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
14k 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
1answer
8k 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 ...
5
votes
2answers
5k 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
46 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
4answers
3k 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 ...
5
votes
1answer
209 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 ...
4
votes
2answers
2k 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
1answer
731 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. ...
4
votes
2answers
86 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
3answers
203 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
836 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
230 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
214 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" ...
3
votes
3answers
337 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
1k 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 ...
3
votes
2answers
898 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
3k 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
4k 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
400 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
794 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 ...
3
votes
1answer
130 views

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 ...
3
votes
1answer
319 views

How can I identify which wire should hook to my headlight switch in my Mazda Protoge (91)?

The headlight switch in my dash is not connected to anything (I noticed this after the headlights quit working!), so I took the dash panel off in an attempt to find the plug. The only plug I could ...
3
votes
0answers
183 views

How to hack an on-demand rear diff locker on FJ Cruiser bypassing the ECU?

The Electronic Control Unit on my FJ Cruiser is not relaying the signal properly to the rear differential lock actuator when I switch it on. I want to bypass the ECU altogether and make the switch ...
2
votes
2answers
4k views

Radio Wiring diagrams and/or color codes?

I've got an older Nissan truck (1994) that did NOT come with a factory radio. A previous owner had an aftermarket style radio installed, and the installers used one of these universal radio ...
2
votes
1answer
142 views

Suzuku Katana does not start after an accident

I have a Suzuki Katana GSX600F. So, after an accident I was in, I rode the bike home and all was fine except a little cosmetic damage, then in a rainstorm it tipped over and after picking it up and ...
2
votes
1answer
21 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 ...
2
votes
1answer
32 views

installing car radio - cords issue

I bought a simple radio, and i am trying to install it. From the new radio the following wires exist: speakers: 2*grey, 2*pruple. 2*blue, 2*green. Yellow - go to battery Black - go to ground red (acc) ...
2
votes
2answers
86 views

1987 Yamaha FZ700 headlights not working

I recently bought a 1987 Yamaha fz700, and the owner said the headlights didn't work, and I can't figure out what's wrong. We checked some of the wiring out, and the bulb connectors have no power ...
2
votes
2answers
5k views

Amp Install Question. Splice in pre or post factory amp?

I am planning on installing an amplifier in my 2008 Mustang and hoping to keep the factory head unit for now. My amplifier supports high level input through the RCAs. My question is should I ...
2
votes
1answer
57 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 ...
2
votes
1answer
183 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 ...
2
votes
1answer
116 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 ...
2
votes
1answer
462 views

2003 Ram 1500 4.7 Misfiring Cylinder 3

Would a bad fuel injector cause plug not to fire? Weird voltages at harness for cylinder 3 compared to other cylinders. No spark at plug. Coil and plug new and tested on other cylinders. I am leaning ...
2
votes
1answer
928 views

Blower motor resistor Continuously Going Out…or not?

I drive a 2004 Chevy Monte Carlo and the A/C is usually fine. However, this car has gone through 4 blower motor resistors. What happens is that, randomly while driving or when turning the A/C on (it ...
2
votes
1answer
67 views

Honoring A Recall

I recently bought a 2005 Suzuki Reno and have been having some headlight problems. I noticed that there was a recall on them (for headlight problems) back in 2007 and again in August 2012. The CarFax ...
2
votes
1answer
688 views

Is it possible to automatically lock the doors when my Santa Fe is shifted from park?

I'm working on a 2002 Hyundai Santa Fe. I'd like to get the doors to lock when the vehicle is shifted from park, and unlock when the vehicle is shifted to park. There is an indicator on the dash that ...
2
votes
1answer
53 views

Wire attachments for KnuKonceptz Wiring Kit

I just got a KnuKoncepts 4AWG kit and it came with the wires etc. and then a baggie with a bunch of gold tips (circle things)... I was wondering how you attach the wires to these things? Should I ...
2
votes
0answers
60 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 ...
2
votes
0answers
98 views

Saturn SL1 1998 Wiring Diagram

I'm in search of wiring diagram of Saturn SL1 1998. My car does not fire-up anymore, and everything indicate that the interlock has stopped working which stop my car from starting. I want to remove ...
1
vote
3answers
4k views

Ford Fusion 2014 Wiring Diagram

I just picked up a new 2014 Ford Fusion and am planning on modifying the factory audio equipment. I've been searching around on some websites (The 12 Volt and various forums) and can't seem to find a ...
1
vote
2answers
189 views

what are the methodes to improve head lights of a car?

please advise me to improve my head light for better lighting. original toyota carina AT 150 square type 55W lamps available and its difficult to drive in city areas and also rainy and misty areas. ...
1
vote
2answers
78 views

Honda Accord Coupe 1999 Overhead Lighting Keeps Blowing Out

The overhead lighting keeps blowing out and the fuses blow out about every day. I have used 4 so I don't know where to start looking. All of the inside lights Any ideas?
1
vote
5answers
3k views

Horn / hooter works when car is off, not when car is on?

I have a (South African) Opel (Chev? Vauxhall?) Corsa bakkie (ute?). But I think this is more a general question than specific to this type of car. However, this model I own does not have many onboard ...
1
vote
1answer
63 views

New CD Receiver requires the microphone for Bluetooth audio?

I just installed a Pioneer FH-X720BT CD receiver in my vehicle. I did not install the external microphone that came with it as I didn't want a wire hanging around, and I assumed that the microphone on ...
1
vote
1answer
562 views

Spark plug wire resistance

Question(s): What should the Resistance be for spark plug wires on a 2000 Blazer? If they're supposed to be 2,000-3,000 Ohms, at what ohms should you look to replace them? Is the resistance of ...
1
vote
1answer
701 views

Truck won't start with key, but will remote start

1996 chevy suburban 1500 4/4 5.7 liter vortec ... My truck won't start when I turn the key. I get nothing like its not getting juice. But when I use a test light it has juice on the starter. So when I ...