Re: voltage drain?

Posted by Janicholson on October 18, 2006 at 16:39:05 from (66.173.50.27):

In Reply to: voltage drain? posted by Russ Lowry on October 18, 2006 at 16:03:51:

The problem can be found with minor trouble shooting.

First charge the battery with the pos post disconnected from the tractor cable. Leave it disconnected.

Next use a portable/handheld volt meter to check the drain as follows:
1- Place the red lead from the volt meter on the positive post of the battery (use a locking pliers, or small C clamp, to keep it on there, being careful to not ground the pliers/clamp.
2- Place the black lead on the cable clamp that usually goes on the positive terminal but was disconnected above.
3- Look at the reading, if there is a major drain on the battery it will read 12 or more volts, maybe 12.6. If there is no major drain, it will read less than one volt.
If it reads 12+ volts, begin by disconnecting one wire at a time, then checking the volt reading and reconnecting the wire if it is still at 12+ volts Use this order of disconnect.

Alternator big wire from alternator. If volts drop, it is probably bad diodes in the alt.

Alt other wires one at a time. If these it may need an internal voltage regulator.

Light switch power lead from fuse/amp meter. If this is it, the switch is wired incorrectly or bad.

Big Wire from starter switch to starter. If this is it the switch may be bad leaking current when off.

Smaller (about #10)wire from start switch to amp gauge. If this is the problem, the wire, or amp meter may have a short to ground. Good luck, John T has a trouble shooting guide on this site in the archives. some of it is for gen systems and other parts for alt systems, good luck, JimN

Finally wire from

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