K
wiring this relay...
low mazda
+1y
I need help wiring this thing. I know one of the big conn. is for my battery and the other is for the comp. and i know the two small ones are for a ground and my pressure switch, but does it matter which big one goes to the battery and comp, and which small one goes to the ground and pressure switch?
draggindimes
+1y
nope doesnt matter which side
sadisticiron
+1y
Edited: 12/29/2005 7:05:10 PM by sadisticiron
u wanna take the 4 gauge wire going to the comps and hook it to a 100 amp contiuous to one of the big terminals and hook the comps power wire up to the other side of the relay. ground one of the small terminals with 4 gauge wire to the frame and then hook yor presure switch wires on to ignition on the other to the last terminal and your done
u wanna take the 4 gauge wire going to the comps and hook it to a 100 amp contiuous to one of the big terminals and hook the comps power wire up to the other side of the relay. ground one of the small terminals with 4 gauge wire to the frame and then hook yor presure switch wires on to ignition on the other to the last terminal and your done
low mazda
+1y
Originally posted by sadisticiron
Edited: 12/29/2005 7:05:10 PM by sadisticiron
wires on to ignition on the other to the last terminal and your done
one of the wires from the pressure switch to the relay, and the other to a switched lead? or does the other wire from the pressure switch go to a ground?
Edited: 12/29/2005 7:05:10 PM by sadisticiron
wires on to ignition on the other to the last terminal and your done
one of the wires from the pressure switch to the relay, and the other to a switched lead? or does the other wire from the pressure switch go to a ground?
dssur
+1y
Originally posted by sadisticiron
ground one of the small terminals with 4 gauge wire to the frame
I agree with everything except using 4 ga wire for the small lead. Its a ~1a trigger circuit, you could wire it to ground with 22 ga.
But yes, like you said it doesnt matter which is which.
And blitch, you got it right. The pressure switch is just that, a switch. So the ignition 12v+ flows through the wire to the first pin of the pressure switch, if there is less than max psi in the tank it flows out of the second pin to the small terminal of the relay, since there is ground on the other small terminal the internal coil energizes and closes the two big contacts turning the compressor on.
You could also trigger by ground, and put one small terminal of the relay straight to the ignition, ground one side of the pressure switch and run the other to the other small terminal of the relay. It will work exactly the same.
In both cases, the compressor will shut off with the ignition, a big plus if you get a leak in the middle of the night, saves both your compressor and your battery. You could just wire it to a switch in the dah, but if you forget to turn it off, hello dead battery and likely dead compressor.
ground one of the small terminals with 4 gauge wire to the frame
I agree with everything except using 4 ga wire for the small lead. Its a ~1a trigger circuit, you could wire it to ground with 22 ga.
But yes, like you said it doesnt matter which is which.
And blitch, you got it right. The pressure switch is just that, a switch. So the ignition 12v+ flows through the wire to the first pin of the pressure switch, if there is less than max psi in the tank it flows out of the second pin to the small terminal of the relay, since there is ground on the other small terminal the internal coil energizes and closes the two big contacts turning the compressor on.
You could also trigger by ground, and put one small terminal of the relay straight to the ignition, ground one side of the pressure switch and run the other to the other small terminal of the relay. It will work exactly the same.
In both cases, the compressor will shut off with the ignition, a big plus if you get a leak in the middle of the night, saves both your compressor and your battery. You could just wire it to a switch in the dah, but if you forget to turn it off, hello dead battery and likely dead compressor.