1970 C10 Help with alternator/external regulator - C10Trucks.com
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Old 03-22-2020, 06:03 PM
Broberson Broberson is offline
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Default 1970 C10 Help with alternator/external regulator

I'm trying to wire an external regulator. The PO I bought the truck from had the wiring set up for an internal regulated alternator, but a mechanic mentioned to me in a previous setting that it was "magnetized" on the front, which I could verify, and he said that the alternator needed to be replaced. That, in addition to the PO chopping up everything under the sun (horn would honk at any given time, he cut into the pink ignition wire and spliced in a radio), I wanted to go back to the stock wiring, so I bought a universal kit from american autowire.

The alternator I have now in addition to the wiring I have set up (the R&F plug I bought had different colored wires, so looking at the back of the alternator, blue from regulator is spliced with black, and white from regulator is spliced with blue). I just bought a new alternator from O-O-O, Oreilly, about a week ago because I, in my ignorance, wasn't sure where the problem was.

What I've been able to figure out is that there isn't a signal from the external regulator to trigger the alternator to charge the battery, giving me the problem of draining the battery when the lights are running.

My questions:
1. Can I successfully wire up the external regulator and alternator by running a brown wire with 10 ohm resistor from the accessory terminal on the ignition to the #4 terminal on the external regulator?

2. If I jump the wires to bypass the external regulator, can I again run a brown wire with 10 ohm resistor from the accessory terminal on the ignition and combine with the white wire behind the alternator?

3. does anyone know if this is an internally regulated alternator? Please see below.

Any information is greatly appreciated.
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Old 03-25-2020, 08:58 PM
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Blue Goose Blue Goose is online now
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Join Date: Dec 2012
Location: S Texas
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I'll see if I can dig up an old wring diagram for you.In answer to your question a 10 ohm resister will work.Once I just wired in a 1895 bulb in ignition circuit and that worked fine
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Old 03-26-2020, 10:48 AM
buds56 buds56 is offline
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Location: virginia
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hopefully this diagram will help

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Old 03-26-2020, 12:25 PM
camauto camauto is online now
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Join Date: Sep 2019
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Default Charge Wiring

1. Yes this should work.
2. Do NOT do this step at all!
3. NO, this is NOT an internally regulated alternator.

The wiring diagram that was posted here should help you with the wiring. If your vehicle has an "Idiot lite" then the bulb resistance should "tickle" the circuits to make the alternator to excite and charge correctly after start up. Most GM vehicles with the idiot lite had a resistor that "paralleled" the lite bulb (shown in the diagram as the 24 BRN/W wire. This was to allow the charging system to work even if the lite bulb burned out and was not noticed by the driver.

If your vehicle has an ammeter, then the resistor wire was installed at the factory to do the job of the bulb to tickle the system to get it going at start up.

email me if you need picts, I have pictures that are too large to upload here I guess

Last edited by camauto; 03-26-2020 at 01:30 PM. Reason: add note
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