I am converting the boat
to a holley red marine electric pump
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.