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What is the alternator output voltage when running?
 

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Discussion Starter #22
It was at 12.10 but is going down. I think I need to trace the green wire. I have a battery light that does not come on when you turn the key and the bulb is good
 

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Yes, the output voltage should be a minimum of 1V over the battery voltage when charging, so that's not so hot. But the green wire is just a warning light, on vehicles with external regulators and an ammeter it's not even connected. When it is, the warning lamp is parallel to a 500 ohm resistor.
 

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Discussion Starter #24
I found the problem. The green red wire was not making a connection on the back side of the instrument cluster. Fixed it and she is charging good. Thanks for all of the help.
 

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i am looking to order a 270 amp 3g for my tow truck. do i need a small case or large? and what type of fuse and size should i use? also what gauge of wire?
 
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