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Tractor Talk Discussion Forum

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

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Brad Gyde

12-05-2012 05:42:42

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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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12-05-2012 06:37:20

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 Re: 12v charging problem.. What am I missing? in reply to Brad Gyde, 12-05-2012 05:42:42  
I use a little "peanut" bulb like most cars use in their side marker lights, and license plate lights. Sockets are available from NAPA.

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12-05-2012 06:07:00

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 Re: 12v charging problem.. What am I missing? in reply to Brad Gyde, 12-05-2012 05:42:42  
Quoting Removed, click Modern View to seeAs LJD said, probably not enough excite current. Yes, it has worked in the past, but every alternator isn't absolutely identical & when it did work in the past, it was marginal (but works counts). Yes, hundreds have gotten by with those little bulbs in the past....most likely because the bulb's cold resistance is low enough to shock/jolt the alternator field, because those little marker/clearance/dash bulbs such as 194, 1895, 1815, 53, 57, only draw about 1/10 to 3/10 th of an amp AND the field begins to kick in at about 3/10 th amp (right on the edge/marginal). GM placed a 10 Ohm/6.25 Watt resistor in parallel with that little idiot light so as to provide nearly a full ampere of excite current.

You could parallel more little bulbs, use larger bulb, or do as GM did and parallel with a resistor, or just use a diode.

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