Re: battery/generator problems

Posted by Dean on August 01, 2001 at 10:38:14 from (208.166.219.146):

In Reply to: battery/generator problems posted by Don E. Foster on August 01, 2001 at 08:25:27:

Assuming you have a mechanical regulator, remove the cover and look at the points with the engine off. The must be open or you have a serious fire hazard on your hands. DC generators are selsyns; if you rotate the shaft, it will generate dc power; if you feed it dc power it acts like a motor and wants to turn. Because it can't, it will heat up and possibly start a fire. If this is the case, remove the negative battery cable before you leave the tractor unattended.

When the engine is on, especially right after starting, the points should be closed. As the engine warms up, you should see the points bounce a few times (and flicker on the ammeter) and then the points should open until the battery voltage drops below the set charging voltage.

If either of these things don't check out, look at the wiring. Have the generator bench tested. Have the battery load tested. A shorted battery can cause charging problems.

BTW, unless you know for a fact the wiring is original, or you rewired it and you know it is right, don't use the ammeter as a guide. Many times old tractors are not wired correctly. The only way to know for sure is to visually inspect it by comparing it to a wiring diagram from the service manual. You can verify that the generator is charging by reading voltage across the battery terminals with he engine running and points closed. It takes about 7v. to charge a 6v. battery.

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