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300 Farmall charging question

3

300guy

Member
I have had the generator overhauled and a new regulator. My question now is the ammeter doesn't seem to read correct. At idle (700 rpms) my digital volt meter reads 7.1 to 6.8. At WOT it reads 8.2 to 7.0. With the brights on it reads 10.2 to 8.2. Yet the ammeter will read straight up and sometimes at WOT it will be slightly on the charge side. At idle it is about a 1/4 discharge and a lot of the time stays on the discharge side. When I shut the engine off it stays slightly below on the discharge side. I would say I need a new ammeter?
The battery always starts the tractor and never acts as if it is low on charge.
 
A Digital meter reads an instantaneous sample of the electricity in a wire, or across a source. As a result it does not average the source. A meter with a needle will average (as will expensive digital meters (usually over 100 bucks.) As your charge rate goes up, (more load on the gen) the spikes in the wave form get bigger. Not to worry at all. Jim
 
An old (if it still has the original) moisture and rust infested mechanical ammeter movement isn't the most accurate instrument out there HOWEVER see where it reads with the tractor off (hopefully dead center) and with it still off turn on the ignition (should register around 4 amp discharge) and then turn on the lights and it should discharge even more. Where it settles with tractor not running and nothing turned on Id consider as the corrected/adjusted 0 center reference.

Like Jim noted a digital voltmeter on and old Generator and Voltage Regulator charging system can be misleading versus an old fashion analog Simpson. If it aint broke don't fix it.

John T
 
OK guys I will ignore it. I know the gauge is the original one. It has had moisture in it before. I guess I am one of those guys who likes to have stuff working correctly. You guys have talked me out of replacing it since is a bugger bear to get to and replace on the 300!!! Thanks for all your moral help!
 
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