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Supe M Charging Question

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Retcol

05-28-2007 03:39:24

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My Super M has been converted to 12 volt with an alternator. I notice the gauge doesn't seem to move. How do I check to determine if it is the gauge or the alternator isn't working?

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Bob M

05-28-2007 08:46:04

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Re: Supe M Charging Question in reply to Retcol, 05-28-2007 03:39:24

Test for the ammeter function (assuming the ammeter is wired up correctly...): Turn on the ignition or the lights. The ammeter should indicate about -3 amps (ign), or -7 to - 10 amps (lights).

If the needle stays on 0, place a small magnet close to the ammeter face and move it around. The gage hand should move one way or the other. If it does not the gage hand is stuck (which happens a lot). Only fix is a new gage.

And as the others mention, you can test alternator function with a DC voltmeter across the battery terminals. It should read about 14 - 14.5 volts with the engine running at 1/2 throttle. If the voltmeter shows less than about 13 volts it means the alternator is not working.

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John T

05-28-2007 06:04:08

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Re: Supe M Charging Question in reply to Retcol, 05-28-2007 03:39:24

Its usually NOT the ammeter, if thats the "gauge" you were referring to. A typical galvo type (not an induction type) ammeter is almost like a dead short circuit so the voltage on one side ought to be near the same as on the other. Hals method of measuring the battery voltage is best, it ought to be around 12.6 volts setting tractor NOT running but rise to the 14 and over volt range at RPM if the charging system works.

What alternator you have?? If its a 3 wire GM 10 SI are you sure its getting excitation voltage on its lil No. 1 side terminal?? and miost all alternators require Negative ground and a reversal of ammeter leads if it was Positive but you switched to Negative ground John T

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El Toro

05-28-2007 04:14:20

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Re: Supe M Charging Question in reply to Retcol, 05-28-2007 03:39:24

You can measure the charging voltage at the battery using a volt meter set on dc voltage. The engine should be at 1/2 throttle. You should
have voltage around 14.5 volts. Hal

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