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Old 03-10-2014, 08:49 AM   #1
57kansastruck
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Join Date: Sep 2013
Location: new carlisle ohio
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LT1in a 57. alternator wiring help needed

I installed a LT1/4L60E, in a 57 3100. The engine runs strong and I'm buttoning up the remaining issues and readying the truck for paint. I researched online on wiring up the alternator, and learned that I need to run a 12 volt switched positive lead to the alternator, to the exciter. This "turns on" the alternator. I read that the wire needed a 470ohm in line resistor. I went to radio shack and bought a 470 ohm resistor. Not knowing which "watt" to buy, 1 watt or 1/2 watt, I bought both. I soldered in a 1 watt resistor. The plug from the original wiring harness has only 2 brown wires. I could only find online that the "L" terminal was to have the 12 volts with resistance. I did that and have no charge from the alternator. I'll remove it and have it tested, just to make sure it works, and rule out a bad alternator. But I believe it will test okay.
Has anyone out there had any experience with this? I would really appreciate some instruction and advice. Pictures would be amazing. Thanks in advance. Jason
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1957 3100 short bed. LT1/4L60E. Clip. 4 wheel disc. Rack & pinion. Camaro posi rear. Power steering.
1956 Chevy bel air 2 dr 396/4spd project
1957 Chevy bel air 2 dr. 327/700r4
1970 corvette. 350/400. All original. 1969 Camaro SS.
1966 Chevelle, real 138 VIN Super Sport. 4 speed, bucket seat, console car. Big project.
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Old 03-10-2014, 01:30 PM   #2
mr48chev
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Location: Toppenish, WA
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Re: LT1in a 57. alternator wiring help needed

There is info on the net for hooking up those alternators. You can probably finding it by putting the model of the alternator in a search.

Here: http://67-72chevytrucks.com/vboard/s...d.php?t=157126er

Several links here : http://www.nastyz28.com/forum/showthread.php?t=144477

I think you are pretty well on the right track from what I read on those pages. A guy sold me a CS130 at a yard sale for 3 bucks with a bracket on it so I'm interested in how they hook up. I didn't need the bracket so it goes in the swap meet box as I am not sure what engine it goes on.
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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.

Last edited by mr48chev; 03-10-2014 at 01:58 PM.
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