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Tractor Talk Discussion Board

Re: 12v charging problem.. What am I missing?

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Posted by Brad Gyde on December 05, 2012 at 05:42:42 from (

In Reply to: 12v charging problem.. What am I missing? posted by Brad Gyde on December 04, 2012 at 20:32:58:

Your assumptions are correct, and you read it correctly.. #1 is the terminal I am using to excite (I opted to leave that out last night). The light will come on and stay on, unless I jump the excite terminal to 12v positive, then it will charge (and when it charges, it will do so even at a idle)

So, I will go with not enough power to excite.. I Know (as of last night) I had about 12.3 volts at the batt terminal on the back of said alternator, but I never did check voltage of excite wire, but I will today.. But for the sake of assuming, what would you recommend if I do have low voltage? Could my bulb have too much/little resistance? I quickly tried to find a picture of the light I am using on the NAPA website, but without the part number handy that could take all day, but it is a small "sealed" light, about 1/2" in diameter.. I have seen similar used in semi trucks and the like for indicator lamps.

I would like to add that ALL wiring, gauges, battery, etc is new, and as I also said, I wired it just the same as I have many times before, using the same components as I always have, which is what has me stumped..




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