Join Date: Dec 2002
Location: Saint Louis, Missouri
Re: Should I keep original wiring harness ?
If the conversion to the new motor and electrical additions are done well and proper, then there may be no problems BUT even though you would hope all circuits would be fused, some may not be.
If for instance, you have the positive battery cable going down to the starter and the cable rests against the exhaust and after a while shorts to ground, there was is no protection on that circuit years ago.
While I have yet to do any personal tests with fusible links, and be able to add how they perform in relationship to a fuse which you can easily find specifications on, I've seen some wiring after a fusible link be questionable as to it's looks and how I think it might have been overloaded and the fusible link still be good. Who knows too that if an original fusible link got burned up and the wire was long enough to be reattached looking original, but now what should be there is not and an unsafe situation is there to someone not knowing any better.
If on the conversion you have the time, yes, look over everything closely to see how things are. Maybe take apart the bulkhead connector and look to see how the main feed terminal on the engine side is as well as the mating terminal on the interior side behind the fuse block. This connection passes the most power through it and then take a look at the starter solenoid terminals also in the bulkhead connector. If you have the fuse block unbolted off of the firewall, separate the fuse block portion from the firewall bulkhead portion and look at the larger wire connections on the backside of the fuse block for any overheating.
If you have a good digital meter, do some voltage tests with the car not running and then running and when different accessories are on and when the car is at idle or a highway RPM. This will gibe you something to go back to if needed should an issue arise later.
Being an old car, and who knows might have been into it, double check that if a particular fuse should be a 20A, it is the proper size and not that someone has replaced it with a 30A one.
1974 Spirit Of America Nova (being restored), 1973 Nova Custom, 1968 Chevy II (Garage Find 2012)
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