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Old 06-21-2012, 06:13 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
Posts: 276
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.

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.

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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