Hello, I am in need of guidance to the correct harness to purchase. Auto electric is not my bag. So I wouldn't know if I am looking at correct schematic anyway. All of what I have found so far is either vague or confusing. Thank you.

1989 Dodge W-100 4x4 pickup with 318 V-8 and automatic transmission. Also, it is full 8 foot long bed.

 

To my knowledge no one makes a replacement harness. Who/where where you looking?

 

Thank you for your reply. I have looked online at Painless Performance, Zorro, and a few others. The pictures offer no real detail and any text description, if one should even exist, is too brief and lacks specifics.
I've only thought of the loom since the truck lived most of it's life off road in northern AZ desert and I thought the heat and dust would affect the wiring. I thought mixing new with old wires could lead to more problem. But maybe a loom is really not required. Like I said, I'm not knowledgeable about auto electric.
Intermittent brake lights, now failed interior cab dome light, open door buzzer, radio, and wiper. All these didn't happen at once but they all did occur over, say a six month time. It seems like a cascade of failures.
Two years ago I did have an auto electric shop trouble shoot and repair the brake lights but that problem is back again.

 

Also, right now I am in Orange County in SoCal.

 

Well since you're not working on a damn Chevy (thank God) painless well, isn't.
For what you are talking about you're jumping the gun big time in looking for a harness. That truck is 30+ years old not surprised a few things as r e getting finicky. A square body dodge from the desert sounds like a truck I'd love to have.
I've been looking at Craigslist in other places around the U S trying to find a rust free one.
But at the same time not sure if I'd be forced to stay home an extra couple of weeks with the covid BS going on.
I should have bought the 85 D250 that I was talking to the seller of in Texas last fall before the BS started. Must be a Dodge and older than 93. Prefer older than 88

 

Volaredon, our family has MOPAR running through our veins. You wanna talk about regret? How about the five Challengers, two RRs, two 'Cudas, three Super Bees, my little brother had. They all were in fine shape when he sold them one at a time in the late 80s - early 90s. On a test drive after he got one of the RRs back up to snuff, I thought the speedo was broken because it showed 140 but it felt like butter and I wasn't even trying to get to that speed. I was edging to 200 when the HP was gaining on us so I shut it down. The patrolman liked the chase at that speed that he just said be careful, not ticket! We've rebuilt early Darts, including Dart stationwagon, Polaras, too many to mention, all Dodge. We three brothers wrenched on all kinds of Dodge cars. I branched off into Dodge trucks because of my trips into the back country.

Anyway, this particular truck has been great since I picked it up in 2008. The guy who sold it to me worked at the USDA and bought it at the yard as it was about to go to auction. It lived in S. Utah then N. AZ. Now for past 3 years in, ugh, SoCal. These last three years I drive it less than 1,000/year. It is at 33,000 original miles. It has been a great truck and would hate to see it go. But I'm thinking of sailing the Pacific again and don't know when I would be back more than for a short visit. So either I put it in long term storage or sell it.

The main reason I want to fix the electrical is so I don't risk getting pulled over. When off road, who needs tail lights? However, like I mentioned, I am concerned if the various faults are a sign of future cascading failure. It really is a great truck. I get unsolicited offers often.

 

Your best bet is find what are the problem areas and then see if you can find what is needed to fix the one you have. I did some digging and the old mopars 60/70 there are some complete harness available (not cheap). But if it's a Dodge truck forget about it. From what you described i would check for good grounds. Look at the connection(plugs) for any terminals showing signs of heat/corrosion. I know electric is not your strong point but either you or someone needs to look threw it. Anything can be figured out with a wire diagram and a multi meter(and time).

 

My most recent buy, an 85 D150 with a slant 6, I did have to replace the underhood harness, I have never seen one so butchered in all my life. I'm a fleet mechanic for the miserable state that I live in (Illinois)
this truck is surprisingly solid, minimal rust, but it's wavey, old guy couldn't see that good, and couldn't have had a wide enough garage door opening if it was 50 feet wide. I wound up starting over with a junkyard harness and got rid of the fusible links in the process, I wired in an underhood fuse box like the newer ones have. All crimped, soldered and heat shrink. Not sure yet if it will keep the slant 6, as I have 318s, 360s and a 440 with very few miles that came from a motorhome sitting here.
But I am also a regular at the slant 6 website, really thinking about seeing what I can do with one. I have another slant block sitting in the machine shop right now, it depends on what they tell me that I am waiting for to see how I will proceed. I have an extra slant 6 head here that I am trying my hand at porting and polishing on.
If they come back and tell me something really bad (cracked block? I got this engine in pieces as a core. See what I mean?) then I will put something else in it. But since it's a 727 trans and not a 904 I'd like to keep it. and I would have to find a different trans and mounts, etc to put a V8 in it/ which I don't have around any more like I used to.
hopefully money saved by not having to find a trans, mounts, radiator and such will be more I can put into souping up the 6. I'm kicking the idea around of a small turbo.
The original engine runs pretty good, was better with the other carb I had on it, that went on to my kids slant 6 powered truck for now.