On Mon, 04 Sep 2006 07:19:29 -0700, DeserTBoB >
wrote:

>However, if there's a high
>resistance in the contactor circuit, you'll see a large voltage drop
>here. Also, when/in the motor refuses to turn, you'll probably see
>nearly full battery voltage here, so set your voltage meter (if it's
>not autoranging) to accommodate 12 VDC. <snip>

PS: If there's a brush or winding fault in the motor proper, you'll
probably get zero voltage drop on the contactor as well, since the
motor side will still be up to battery potential and the voltmeter
can't "see" the negative battery side through the fault. Another
common failure on NDs is worn brushes, so be prepared for this, as
well.