If you had a high-resistance connection between the chassis and the engine
block, it might be able
to carry the ground current of the ignition circuit, but not the additional
current of the OD
circuit (which is grounded through the tranny/engine assembly).
If this is the cause of the problem, you would see the voltage between the
engine block and chassis rise well above
zero when the OD was switched on. This would be true no matter where the
OD supply voltage was supplied from.
Doug
At 01:55 PM 3/14/2005 -0500, you wrote:
>Doug,
>The early Spits used the SW side of the coil to get power to go to the
>switch. However, I also had a starter problem and in troubleshooting I
>found a loose ground for the battery to the body. I haven't driven it
>enough to see if fixing that problem may have fixed the OD problem. When I
>look at the schematic it just doesn't make sense that the two (OD and
>ignition) have any interface and the problem still existed after moving the
>switch power source. Thanks for the reply, I'll let the list know what
>comes of the problem
>Pete
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