91 W250 wiring woes - Dodge Cummins Diesel Forum
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post #1 of 9 (permalink) Old 11-23-2015, 04:49 PM Thread Starter
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Unhappy 91 W250 wiring woes

hello!
i've got a 91 (not 91.5) w250 automatic..... when i got it 4 years ago it was an old ranch truck and the wiring was a hack job... now it's a total nightmare! heh heh...
I've been looking for new wiring harness online, i saw on these forums that painless was recommended- but can't find my truck on there and really i'm scared to know the price anyhow...
I was hoping to get some opinions on if it's worth it to get an old harness off a parts truck, to buy a new one, or to just pull out my old one and re-wire the zillion problem wires and connections.

also if anyone has a parts truck in AZ i need so many parts i could make you rich...

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post #2 of 9 (permalink) Old 11-23-2015, 05:27 PM
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I'd say that a harness from a parts truck would be worth a shot. I've used junkyard harnesses off old cars several times without any trouble. Your eyes will tell you if the harness is good. If it isn't hacked, it'll be plain to see. The only trouble I've seen is a harness that lays directly on the engine, and the insulation on the wires gets rock hard.
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post #3 of 9 (permalink) Old 11-23-2015, 05:53 PM
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IMO, I see no reason to change out one 25yo harness for another. Make sense of what you have.... address what doesn't work... and fix it right.

93 W250 Club 6BTA |5spd |60/80/3.54/Lockright |4" lift |315/75R16 |HX35 |5x.012s |BD pin & gov spring
84 Ramcharger (project) 6BT |5spd |WH1C| D70/3.07 ...plus a few other 75-93 D/W trucks
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post #4 of 9 (permalink) Old 11-23-2015, 07:34 PM
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not saying not to fix it right, but some new harnesses are pretty expensive, and not all of us have that extra money, especially this time of year. In the end, it's the one working on it that decides what works for him.and, the OP said his wires were a hack job, chances are he can find one that hasn't been cut on.
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post #5 of 9 (permalink) Old 11-23-2015, 08:30 PM
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I just meant some wire, soldering gun, and heat shrink go a long way. Not happy with the factory wiring in my truck.... but I modify it as needed.

93 W250 Club 6BTA |5spd |60/80/3.54/Lockright |4" lift |315/75R16 |HX35 |5x.012s |BD pin & gov spring
84 Ramcharger (project) 6BT |5spd |WH1C| D70/3.07 ...plus a few other 75-93 D/W trucks
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post #6 of 9 (permalink) Old 11-23-2015, 09:01 PM
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totally agree. But I've had stuff with wiring that was a hack job, and was easier and quicker to just find a replacement. lot of hack artists out there...miles of the same colored wire....duct tape....scarey stuff.
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post #7 of 9 (permalink) Old 11-23-2015, 09:08 PM
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Quote:
Originally Posted by u2slow View Post
I just meant some wire, soldering gun, and heat shrink go a long way. Not happy with the factory wiring in my truck.... but I modify it as needed.
I agree...fixing what you have, which shouldn't be too hard, just time consuming, will be cheaper, and easier in the long run.

1984/93 Dodge Crewcab, W350, 1 Ton SRW, long box, 350K Km's, hydroboost, 366 spring, fuel pin to deep side, 14cm housing, Piston LP, PS IC, Isspro Boost, Pyro and tach, NV4500, 29 spline NP205, 3.54's.
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post #8 of 9 (permalink) Old 11-27-2015, 07:35 AM
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Another vote for fix it. The engine harness comes out pretty easily. Lay it on a table and go to town.

Also a good time to figure any add on electrical stuff you may want and add a dedicated fuse block for them, a relay block too. These can be found new or taken from a junker car.

92 d250 le creampuff, rc auto and stone stock.
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post #9 of 9 (permalink) Old 11-27-2015, 01:32 PM
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I converted, and re-wired my 48 Desoto from 6V positive ground, to modern 12V negative ground. Used a complete aftermarket universal harness, front to back. Took me months to do it all right....solder every connection, dielectric grease, shrink tubbing, and finding, and using proper plugs for all the connections.

I could have repaired and old OEM harness in a few weeks.

1984/93 Dodge Crewcab, W350, 1 Ton SRW, long box, 350K Km's, hydroboost, 366 spring, fuel pin to deep side, 14cm housing, Piston LP, PS IC, Isspro Boost, Pyro and tach, NV4500, 29 spline NP205, 3.54's.
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