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inline resistor to alternator

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Old Dec 15, 2014 | 04:08 PM
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Default inline resistor to alternator

could some one tell me what line to put the 10 ohm 10watt resistor in, I think it is used to excite the alternator to get it to charge at low RPM's. long story it went bad and took out the wiring harness (melted) after the repair I forgot what wire it was on and want to do it right as I don't want to repair the harness again Thamks Tom
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Old Dec 15, 2014 | 04:14 PM
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Originally Posted by tomandjanet2
could some one tell me what line to put the 10 ohm 10watt resistor in, I think it is used to excite the alternator to get it to charge at low RPM's. long story it went bad and took out the wiring harness (melted) after the repair I forgot what wire it was on and want to do it right as I don't want to repair the harness again Thamks Tom
What resistor? What line? What year car? What alternator and wiring design? If you want some help, we need more info.
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Old Dec 15, 2014 | 04:24 PM
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Default resistor ???

Originally Posted by JohnZ
What resistor? What line? What year car? What alternator and wiring design? If you want some help, we need more info.
I have a 67 small block, there was a ceramic resistor hidden in the wiring harness and taped over I didn"t know it was there till it went up in smoke and took the harness with it. This is a one wire alternator wired to a non solid state regulator. Thanks again
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Old Dec 15, 2014 | 09:02 PM
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One wire alternators are internally regulated. Is it actually hooked up to an external regulator? Pictures would be nice.
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Old Dec 16, 2014 | 08:07 AM
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Default Resistor in wiring

This is may be what you are referring to. The resistor goes in the "L" port of the plug. Or you can use a 12V gen light bulb as well. Either one works.
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Old Dec 16, 2014 | 08:31 AM
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Originally Posted by tomandjanet2
I have a 67 small block, there was a ceramic resistor hidden in the wiring harness and taped over I didn"t know it was there till it went up in smoke and took the harness with it. This is a one wire alternator wired to a non solid state regulator. Thanks again
It would be hard for one of us to diagnose your problem without seeing it or understanding how it was wired. Suffice to say, a one wire alternator has a solid state regulator built into its case and it should not be wired to any external regulator. First, open up the external regulator and see if it really is still a operating regulator or a dummy someone left there to look correct.

Look at the drawing above and make sure your alternator is wired as such. That wire burned because it conducted full battery current from a short. It is possible the regulator in the alternator is toast. I would pull the alternator & have it tested, and rewire it as per the drawing above. Actually, I would order a new harness, regulator and proper 10DN alternator and put it back together as Chevy had it day 1.

Dan
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