JD 40 battery discharging

Rex J

New User
Hi all,

I have a 1953 JD 40 that is discharging the battery when the tractor sits idle for a short period of time (overnight or less). When I have the switch off and connect the battery terminals, I get a pretty good sparking, which tells me I have something pulling it down. Does anybody have any idea on where to start looking, or a general troubleshooting procedure?

Unfortunately I have classic tractor fever but do not possess the necessary skills to cure it!

Thank you for any help,

Rex
 
If the cutout relay were sticking closed (its supposed to OPEN when you shut down DUH) the battery would discharge rapidly, the genny would get warm, and if the belt were removed the genny would spin like the DC motor it is. If the wires on the BAT or GEN/ARM terminal are removed she stops discharging and/or stops motoring (if belt loose) that says the relay is sticking closed.

Heres my Troubleshooting Procedure

http://www.ytmag.com/cgi-bin/viewit.cgi?bd=jd&th=458743

John T
John Ts troubleshooting procedure
 
Put a master switch between your ground cable and where your battery is grounded. That will isolate the battery from being grounded until you're going to use the tractor again. The military has used master switches for years. Here's what they use. Hal
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Agree with the cutout. With a good battery and cold engine (and generator) the generator field will continue to be energized with the engine off and the generator will be warm when everything else is cold, and it will run the battery down.
 
Agree with the cutout. With a good battery and cold engine (and generator) the generator field will continue to be energized with the engine off and the generator will be warm when everything else is cold, and it will run the battery down.
 

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