Running power from battery
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Joined: Jan 2005
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Running power from battery
I am a compresor setup that I am trying to power up. First of all it is for a airhorn and I have a 30amp fuse coming from the battery to the relay. Then im using a upfitter for the pressure switch. But every time that I start the car when the compresor is running, of I turn the compressor on when the car is running and I go down the road, the fuse that goes to the battery blows, every single time. What am i doing wrong here....
Tuned
Joined: Jan 2007
Posts: 297
Likes: 8
From: South of Atlanta
Wiring
If you have the same relay as I do...
1. Battery power (fused) goes to # 87
2. Hot wire leaves relay at # 30 and runs to compressor
3. # 86 goes to ground (frame)
4. # 85 goes to pressure switch on tank to open and close (87 / 30 above).
You need 12 volts accessory power (key on) to go to the other leg of the pressure switch at tank. When the pressure switch calls for air the switch sends 12 volts to relay to make connection from battery to compressor via #87 and #30 above.
I don't know what a upfitter is.
1. Battery power (fused) goes to # 87
2. Hot wire leaves relay at # 30 and runs to compressor
3. # 86 goes to ground (frame)
4. # 85 goes to pressure switch on tank to open and close (87 / 30 above).
You need 12 volts accessory power (key on) to go to the other leg of the pressure switch at tank. When the pressure switch calls for air the switch sends 12 volts to relay to make connection from battery to compressor via #87 and #30 above.
I don't know what a upfitter is.
Last edited by dcsmith; Jul 3, 2007 at 05:30 PM. Reason: typo
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
You need to treat these as 2 individual circuits. They should not be combined at all.
First, print this out:
http://www.classictruckshop.com/club...osch/relay.htm
Your compressor should be on a relay switched circuit, an upfitter switch would be a good use for this. It should be wired like the POWER TO TURN CIRCUIT ON picture, with the upfittter switch being the switch and the ON WITH SWITCH ON light being the compressor and nothing connected to the ON WHEN SWITCH IS OFF position.
The pressure switch shold also be wired with a relay. You need some sort of momentary push button for this. It should be wired like the GROUND TO TURN CIRCUIT ON picture, with the pressure switch in the ON WHEN SWITCH IS ON position and nothing in the ON WHEN SWITCH IS OFF position.
Common horn relays can be purchased at any auto parts store.
First, print this out:
http://www.classictruckshop.com/club...osch/relay.htm
Your compressor should be on a relay switched circuit, an upfitter switch would be a good use for this. It should be wired like the POWER TO TURN CIRCUIT ON picture, with the upfittter switch being the switch and the ON WITH SWITCH ON light being the compressor and nothing connected to the ON WHEN SWITCH IS OFF position.
The pressure switch shold also be wired with a relay. You need some sort of momentary push button for this. It should be wired like the GROUND TO TURN CIRCUIT ON picture, with the pressure switch in the ON WHEN SWITCH IS ON position and nothing in the ON WHEN SWITCH IS OFF position.
Common horn relays can be purchased at any auto parts store.
Tuned
Joined: Jan 2007
Posts: 297
Likes: 8
From: South of Atlanta
I put a toggle switch in my 12 volt accessory to pressure switch line so that I could kill the compressor anytime I wanted from the cab. I can't understand having a "momentary" switch involved in wiring the compressor. I'm not saying I know it all; I just don't get it. Excuse my ignorance in advance.
Tuned
Joined: Jan 2007
Posts: 297
Likes: 8
From: South of Atlanta
Originally Posted by rbaker6336
you don't need a momentary switch
the wire from your cab switch should go to the control side of the relay
the wire from your cab switch should go to the control side of the relay
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Posting Guru
Joined: Aug 2004
Posts: 1,826
Likes: 1
From: Round Rock, TX
actually mine goes from my switch in the cab, to the pressure switch, from there, to the switched side of the relay. If i turn the switch on and the tank is full, nothing happens.
I'm using a 90 amp relay, with an 80 amp inline fuse. The relay main wires are 8 gauge from battery to relay to compressor
maybe this will help
I'm using a 90 amp relay, with an 80 amp inline fuse. The relay main wires are 8 gauge from battery to relay to compressor
maybe this will help
Last edited by TNT in Round Rock; Jul 3, 2007 at 06:06 PM.
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