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Old 06-21-2012, 07:13 AM
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Philscbx Philscbx is offline
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Join Date: May 2011
Boat: 78 S&S, 04 Pro 209
Location: Mn, Minnetonka
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They worked fine on the bench - Forward/Reverse.

If the wires on the back of switch are under 14g -
There must be relays near the pumps - Mine isn't here, or I'd look to confirm.

If in fact there are no relays - this is simply wrong -
and over loads the switch load going double the distance.
It could be simply one wire is loose on the switch - over heated the connection.

If the switch can be popped out of panel -
Then see fried contacts /inside - from loose or burnt connector - Ground.
Connect test light to battery source to confirm Hot/Grounds at the switch.

The pumps would need a good power source for the load they are under,
plus the distance from switch.
Can't imagine done w/o a relay switch pack, with 12 -10g suppling the power near the pump.
Somewhat concerning in a vessel to be allowed to be wired w/o relays.
It would prevent high load damaged leads from starting a fire.

With full power/amps, the pumps would perform as made.
Done wrong - it's like a light bulb on dimmer control half dimmed.
Still surprised circuit breaker didn't see the over load before the switch failed - if true.

I reviewed the links you posted - there was mention in there of ground issues as well.

Usual wire management lacks restraint with wire ties.
If it looks like a monkey food fight of spaghetti under the dash,
it easily leads to these issues, where the slightest snag happens.

I'd like to see that view anyway. I can advise from there.
Restoring aircraft - this is a timely process.


I'd still back trace the pair of wires from pump to a box nearby.
If not found - a call to service to confirm where it isn't .

I don't think check valves apply here,
being the flow has to go both ways in the same port.


Quote:
Well would the fact that the connection to the pump gets the proper voltage in forward or reverse rule that out?
It confirms a hot, but not the ground - depending how the circuit test was connected.
This test also needs to be performed at the switch.


Quote:
Does not appear to me to be ground if it works in one direction and not the other
The ground & hot are switched as pairs - so all it takes is one loose/burnt ground at the switch.
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