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Old 09-02-2012, 12:46 PM   #1
ohmaback
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engine harness

hi, just got a 65swb and am trying to figure out the eng harness. The PO had only 2 wires on the starter, purple to the S terminal on the solenoid, and of course the batt to the battery. I have a new harness, and it has 4 wires to the starter, 2 to the R term, and one to the S term, and a black one to the batt stud. will I have a problem hooking them up as shown ? The PO has changed alot in the engine bay, don't know if it was a 6cyl orig, but it now has a sb chevy in it.Thanks
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Old 09-02-2012, 04:54 PM   #2
truckdude239
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Re: engine harness

does it have points or hei? alot of kits move the alt charge wire to teh statrt post with teh battery cable
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Old 09-02-2012, 09:56 PM   #3
ohmaback
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Re: engine harness

stock dist. w/ points, and also PO ran the coil
wire from the firewall thru a ballast resistor dto the coil
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Old 09-03-2012, 01:38 PM   #4
truckdude239
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Re: engine harness

okay one wire should be a resister wire run from the r terminal to the points and the other i dont know where it goes, should be 2 wires on the big post the battery wire and a wire from the alternator, s terminal should have have one wire as the signal wire
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1971 Chevy c-10 under going a 4.8l LSx swap

Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305

2007 Honda Accord my daily 145kmiles
2002 Honda Accord 4 door With 330k(sisters car)
2005 toyota Avalon 228k( brothers car)
2002 Sububran 5.3 245k
2000 Tahoe 5.3l 378

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Old 09-03-2012, 10:23 PM   #5
VetteVet
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Re: engine harness

Quote:
Originally Posted by ohmaback View Post
stock dist. w/ points, and also PO ran the coil
wire from the firewall thru a ballast resistor dto the coil
Here is a diagram that shows the harness. The pink wire is from the ignition switch and is the resistance wire that drops the voltage to the coil during normal engine running. It joins the R terminal on the starter at the top of the diagram and the yellow wire, which goes to the coil on the plus side.

The yellow wire carries the resistance to the coil for normal running except when the starter is engaged, the R terminal then gets a full 12 volts from the starter circuit which goes to the ignition coil for easier starting.

The purple wire goes to the S terminal on the solenoid and the large cable goes to the large stud on the solenoid.

The ballast resistor serves the same purpose as the resistance wire and one side of it should be wired to the ignition switch and the other side will have two wires connected together one goes to R and one goes to the coil plus.
If the PO has the resistance wire from the key running to the ballast resistor then he is getting double resistance and the engine may not start or will have a weak spark.

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Here is a ballast resistor circled in red. It shows two wires so there might be a separate wire going from the R terminal to the coil positive. Your PO might also have this setup.

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