Quote:
Originally Posted by 67ragtp
Thanks Jody- I need to dig in, the speartech harness has a relay for the fuel pump built in to it and he provides a long grey wire coming out of it. The paper work says to connect the grey wire to the positive terminal on the fuel pump. I did run the ground from the neg side of the pump back up to the second bulk head fitting I installed in the firewall, where the neg battery cable is terminated.
I guess I will cut into my wiring to run 12v to the pump.
Thanks Agian Rich
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yeah, they'll send a +12 volts wire for the pump, but that comes off the relay; the ground of the relay is wired directly into the computer and it turns the pump on/off by grounding the relay. Most computers control the ground side instead of the hot side.
Isn't there a way to just run a 12 volt wire from another battery or ? to a plug on the pump or directly to the pump without chopping into the harness? How does the gray wire attach to the pump and is it outside the tank?
Also check the relay itself to make sure it has 12 volts battery (all the time) at terminal #30, 12 volt switched (key on only) at terminal #86, ground at terminal #85 (this will be wired into the computer itself on most systems) and terminal #87 should be the 12 volts out to the pump (gray wire on your harness). This is if it's a standard 4 lead relay. Of course if you've already checked and confirmed that the gray pump wire has 12 volts for three seconds when you first turn it on then the relay wiring and relay itself should be fine.