Question about 1984 GMC VanDura

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Electrical problems wiring harness in the egine compartment is fried

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Unless the van is in super good condition, likely it's time for the scrapyard.
You may be able to get another harness from a scrapyard though. Then, this will turn your ride into a "project car"
First, you need to find out why the thing burned, otherwise after the new one is back in, it can happen again. Luckily, it's older and does not have as many "exotic" computer controls but you will likely need a new computer and a good once-over of underdash wiring as when harness burns, short circuits and power crossovers happen all over the place.
Try to identify as many intact plugs and wire colours, then label what's there and cut away the harness itself, leaving plugs in place.
Lay out the new harness and try to locate and match connections so you know where they go. If bulkhead connector is intact, plug harness in and begin installing and plugging stuff in. don't worry about plugs in the harness that don't seem to go to anything because most harnesses fit several models and options. Once install is complete, touch positive terminal lead to battery and watch for smoke etc.Turn ignition on and do this again.
Only other option (if you don't need computer system to pass inspection) is to individually wire up necessary systems for starting, ignition and charging. If it's injected you will need to adapt a carburetor to the manifold as injection will not work without the computer.You would then need a low pressure electric pump and need to power up the accessories.
What you do is largely depending upon how much you like it and how much time and $ you want to put into it.. Check with a local electrical shop and see what they charge. That's always another option.

Posted on Sep 04, 2009

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