I am converting the
boat to a holley red
marine electric pump.
The
safety switch I am going to use is a gm 3986857 3 prong
oil pressure switch. Has a common, NO, NC prongs.
Can the
electric pump use the switch without a relay OR is the
electric load running threw the switch too much for it and it needs a relay?
The reason I ask is simply I want to replace the
current low pressure idiot light switch with this 3 prong switch without a 'T' hookup.
the 3 prong switch will just be turning grounds on and off. I will put a relay running off the start wire to the starter and that relay will just ground the
pump negative wire to make it run. If I do this, then all I need is the one pressure switch to run the idiot light and the
pump. The relay will turn on and ground the negative pump wire when the starter is cranked.
When the
oil pressure builds up, the
safety switch will close and ground the negative on the pump and it will run.
If I dont do this, I will have to put in a T and have 2 pressure switches. I currently have an oil gauge pressure switch, so really then I would have to have 3 oil switches on the block. See what I mean?
Currently there are 2 oil pressure switches on the block. One for the idiot light-buzzer, the other for the pressure gauge. I dont want to loose the buzzer idiot light.