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Re: Re: Re: Ammeter Problem
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Posted by Ron on June 23, 2004 at 11:07:14 from (69.179.4.15):
In Reply to: Re: Re: Ammeter Problem posted by txblu on June 23, 2004 at 05:32:21:
Ammeters and more specifically shunts are designed to deal with some maximum rated current. I'm pretty sure both the resistance and heat loss are built into the size of the shunt. For example, the shunt on a 40A meter is far smaller than one on a 100A meter. Having no idea what type he has (or had!) on his tractor I gave him an admittedly general answer. But his statement that when he bypassed his ammeter the engine ran better apparently due to more primary power to the coil keyed me into the fact he blew that ammeter and was very lucky. It seems as if it shorted internally and he is very fortunate he didn't experience a fire. As you know, a properly wired tractor will have all active loads (except the starter of course) run through the ammeter which is driven by the alternator. Assuming the load never exceeds the ammeter's rating, no problem. But I did see the rusty remains of a tractor where the owner replaced the stock 40A alternator with a 100A and added some snowplow type lights. Bingo, the first time the lights got switched on, his tractor promptly burned to the ground.
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