bilge pump wiring

[kmongar]

Hello,
95 VP 5.0FL SX Cobra

I am putting a new bilge pump in. There are 3 wires from the pump; 1 brown, 1 brown with white line, and one black wire (ground). The brown/white wire is the automatic and the other brown one is for the manual pump switch on the dash. After attaching the wires it will work when the manual switch is turned on but does not go on when the float is pushed up.

Three wires come from the wiring harness; 2 all brown, 1 black. One brown wire has 13 volts only with the switch on and the other measures 13 volts with or without the switch on...but drops to 2.5 volts when attached to the brown/white wire on the pump. The old pump was doing the same thing...so I don't think it is a problem with the pumps.

Any ideas?
thanks

 

[Scaaty]

Re: bilge pump wiring

The auto wire has to be connected to a either always hot wire, or a separate wired switch, that you would leave on when in the water.
The manual wire would need a separate switched hot wire...
Might need to do a little re-wiring is the best I can tell ya

 

[Chris1956]

Re: bilge pump wiring

It sounds like you have high resistance on the auto pump wire. Perhaps the fuse is corroded.

I recommend you wire it directly to the battery to test proper operation. If it works properly, either add an inline fuse direct to the battery, or determine the issue with the OEM wiring.

 

[Don S]

Re: bilge pump wiring

Moving to Electrical & Electronics forum.