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Old 05-27-2013
Junior Member
Join Date: Dec 1969
Posts: 15
Default Low voltage at remote pump motor

i have twin 150etxd on a 1990 Grady.
Had a ungrounded sensor on the port remote oil tank giving a yellow indication
Read all the posts and fixed that..thanks.
Problem is now when measuring voltage at brown wire at pump I get 7.5 volts.
I have 12.45 at yellow wire at key and then 8.0 at yellow wire on motor.

Could some internal corrosion in the wire harness really cause this much voltage drop ?

Motor runs good but no oil gets pumped to main tank normally or with emergency switch. Connecting 12 volts directly to brown wire at connector on motor remote tank pumps oil fine.
Thanks for all the help
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Old 05-27-2013
Senior Member
Join Date: Dec 2010
Location: KDH NC
Posts: 9,062

yep, check the connector at the engine to oil tank harness, if that still shows bad voltage under a load then unwrap the harness and find the bad splice about 6" aft of the 10 pin main harness.
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Old 05-27-2013
Junior Member
Join Date: Dec 1969
Posts: 15

As soon as the gale passes I'll take a look. Blowing 50s at Newport, or.!
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corrosion, remote oil tank, wire harness

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