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Re: What in tarnation are these things ??
You can probably spend a few minutes under it with your test light and figure it out. Turn on the head lights and see what wire has power and then shut them off and turn on the left turn signal and see if that works and on to the right turn signal. If you looked at that link for the wiring diagram i posted earlier I think it is wrong after studying it. No convertible trucks on 1959.
My guess is that some time or the other your granddad's lights didn't work and they did quick bandaid job to get them working and that band aid is still there in the form of that orange wire.
As for the trailer connectors hooked up in the back. If everything looks neat and orderly and nicely installed, leave it. If it looks like a bundle of snakes all tangled up cut it all off and start over. I've run into more wiring problems on trucks that were caused by thrown together trailer wire hookups than any other thing.
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Founding member of the too many projects, too little time and money club.
My ongoing truck projects:
48 Chev 3100 that will run a 292 Six.
71 GMC 2500 that is getting a Cad 500 transplant.
77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.
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