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Junior Member
Posts: 13
Reply with quote  #1 
Been working on my projects a while now and finally getting to some wiring harnesses.

Just basically want to be sure that I have got some stuff worked out straight and I'll need to make up some sections of loom because of fitment and routing and what you might call cable dressing.

Starting at the front of the vehicle we have two 9004 and two 9005 lamps which used to be 4651/4656 rectangular lamps each side. Next we have two small fog lights near lower spoiler under bumper. We also have two turn signal lamps, L&R. Also two cornering/sidemarker/parking lamps which function based on switch selection.

High beam low beam operate through a 20-40A fuse, two Bosch relays, the 12v battery, dimmer switch, a blue dash jeweled indicator lamp. And a momentary for dimming @ passing using a floor mounted button toggle. Wiring seems to be 10-20ga throughout. Foglight uses one relay and another 20A fuse. Turn signals operate through column switch and a relay. Hazards do as well but use s separate switch with indicator. Add in connection to battery, starter, alternator and regulator through fuse block and terminals.

We also have a Bosch ECU/ECM/PCM and several others related with their own routing.

Brake light with 3rd high mount LED stop lamp, reverse lights, rear side marker, two license lamps, trunk lamps, all are semi independent of each other.

Radio&audio system have its own harness connecting to 4 speakers, amplifier, CD changer, power antenna and XM device.

Heated seats, power mirrors, courtesy and map lighting, 12v DC jack, hood lamp, door and window switches HVAC system with motors/blowers and switches all travel under carpet and pads and pass through firewall. Provisions also for a external nav system and communication system also there too not just hacked in afterthought.

So in working, issues have been trying to keep things neat and tidy yet serviceable later on. But also trying to follow somewhat standard systems in making sure things get connected proper.

Any ideas or tips you have? I'm interested in learning more about this. So far most of it works but still have minor issues.

Posts: 132
Reply with quote  #2 


Electrical systems can be a pain.  Especially in an older vehicle.  Sometimes, just replacing a wiring harness (or loom), can make things much better.  SOMETIMES, it will just 'move' the problem area from the harness to the pieces HOOKED TO the harness.

But it's one step forward, two steps back.  And while it seems you will NEVER finish a wiring project, take plenty of breaks and think about every step before you do anything.  You CAN do this, just take your time and breathe in and breathe out.

Take some pictures and let us see where you are and what you need help with.  Remember, slow is steady.  Check everything three times.


Junior Member
Posts: 13
Reply with quote  #3 
While I've spent the last 8 months working on this project, I admit its kind of Kitcar'ish as I've decided to 'roll my own' home built custom car, kind of like the guy was doing with BXR Motors Bailey Blade if you've seen that on YouTube. Most of the wiring has been made myself harnesses except for powertrain provided by donor vehicle, and my case is a mid generation LS1. Originally slated for a 350. Having used parts off the shelf helped immensely.

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Senior Member
Posts: 228
Reply with quote  #4 
So, What are you building? When do we get to see some pics?. This advise may be too late for this project but, American Autowire makes complete kits starting from simple 12 circuit all the way up to what you have and beyond. My truck is a 54' and I knew I would be throwing some cash into it. So, I tore out every single wire in the truck and started from scratch with the fore mentioned kit. I bought the 20 circuit so I had plenty for auxiliary items. The kit comes in a cardboard suitcase style box. There are comprehensive schematics and separate bags of wires for each section of the vehicle. (engine bag, dash bag, ect) There are instructions on how to mount the fuse box and the wires are color-coded and labeled every foot. For under $400 I have piece of mind that my truck won't burn up from some cheesy wiring and a clear working knowledge of every wire in it. I wrote specific notes on the schematics where I made changes ie 30a power seat circuit for engine cooling fan. I keep them in a clip board with my build book for reference purposes. I recommend this to anyone building and older project or one where the wire condition is hacked or unknown. Mike 

Junior Member
Posts: 4
Reply with quote  #5 
X 2 on the American Autowire kits.
I used their Classic Update kit for my El Camino.
Plenty of spare circuits for audio, electric fans, etc.
The instructions were very easy to follow.
I will admit, as and I & E tech, I probably had a small advantage, but still, they are very thorough.
I did buy the crimper set for the kit since my kit required cutting and crimping the connectors onto the wires, but that is pretty easy, too.
I had my El Camino rewired, front to back in about 3 days.
Put the battery in, powered circuits up individually and everything worked great.
No smoke, no fire !!
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