Power Source
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Mountain Pass
Joined: Dec 2010
Posts: 217
Likes: 6
I was thinking of putting the relay on the drivers side in the engine compartment or under the steering wheel but still don't know where to hook the main power supply to.
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Ah, main power to pump comes from relay. Relay gets its power from Battery +. Switched power to turn relay on/off. Pick it up from under hood fuse box. And grounds of course. If you use a capacitor, I guess it would go on the power wire from the battery. Just as the print posted earlier except your pump would be where the horns are and horn button wire coming from fuse box. ( unless you want the pump to run when you press the horn 
). You have some options too about how it will work. Im not sure what you have. Does the compressor have a regulator that shuts it off at a certain pressure? Do you want it in it's "on" mode when ever the key is on or maybe a switch on the dash that can turn it on even when the key is off? Or even have it so the key and the switch must be on before the compressor will run?
). You have some options too about how it will work. Im not sure what you have. Does the compressor have a regulator that shuts it off at a certain pressure? Do you want it in it's "on" mode when ever the key is on or maybe a switch on the dash that can turn it on even when the key is off? Or even have it so the key and the switch must be on before the compressor will run?
Thread Starter
|
Mountain Pass
Joined: Dec 2010
Posts: 217
Likes: 6
Ah, main power to pump comes from relay. Relay gets its power from Battery +. Switched power to turn relay on/off. Pick it up from under hood fuse box. And grounds of course. If you use a capacitor, I guess it would go on the power wire from the battery. Just as the print posted earlier except your pump would be where the horns are and horn button wire coming from fuse box. ( unless you want the pump to run when you press the horn ). You have some options too about how it will work. Im not sure what you have. Does the compressor have a regulator that shuts it off at a certain pressure? Do you want it in it's "on" mode when ever the key is on or maybe a switch on the dash that can turn it on even when the key is off? Or even have it so the key and the switch must be on before the compressor will run?
). You have some options too about how it will work. Im not sure what you have. Does the compressor have a regulator that shuts it off at a certain pressure? Do you want it in it's "on" mode when ever the key is on or maybe a switch on the dash that can turn it on even when the key is off? Or even have it so the key and the switch must be on before the compressor will run?I was hoping not to have to run a wire directly to the battery terminal . Is there not a main power block / distribution center downstream from the battery that I can get the power from.
Mark
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Looking at my '06 in the under hood fuse box there is a place for 3 60 amp fuses (21,22, and 23). Two are used one is still open(21). If your truck is similar, that may be a good place. In the harness behind the box, if you look at the heavier gauge wires I think OG/LG is powered all the time and LB/PK is switched with the ignition. Just a thought but many of our trucks have a dangling wire near the HFCM (where the fuel filter is under the truck) that was for a fuel heater. They quit using the heater on many models but the wire is still there, if it's the proper gauge (matches the compressor wire size) that might be a good place.
Sorry for the mix up on the vacume pump/compressor not sure where I got off track there. Also, I would caution you that I still think the dedicated relay circuit is the best way to do this.
Sorry for the mix up on the vacume pump/compressor not sure where I got off track there. Also, I would caution you that I still think the dedicated relay circuit is the best way to do this.
Last edited by Rusty Axlerod; Jul 10, 2012 at 05:10 PM. Reason: Add
Thread Starter
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Mountain Pass
Joined: Dec 2010
Posts: 217
Likes: 6
Looking at my '06 in the under hood fuse box there is a place for 3 60 amp fuses (21,22, and 23). Two are used one is still open(21). If your truck is similar, that may be a good place. In the harness behind the box, if you look at the heavier gauge wires I think OG/LG is powered all the time and LB/PK is switched with the ignition. Just a thought but many of our trucks have a dangling wire near the HFCM (where the fuel filter is under the truck) that was for a fuel heater. They quit using the heater on many models but the wire is still there, if it's the proper gauge (matches the compressor wire size) that might be a good place.
Sorry for the mix up on the vacume pump/compressor not sure where I got off track there. Also, I would caution you that I still think the dedicated relay circuit is the best way to do this.
Sorry for the mix up on the vacume pump/compressor not sure where I got off track there. Also, I would caution you that I still think the dedicated relay circuit is the best way to do this.
No dedicated relay is the way I would like to go but was looking for a power source for the relay other than directly to the battery. Surely there is a power distribution block somewhere. A wire bolted to the battery terminal looks so unprofessional
Mark
Senior User
Joined: Apr 2012
Posts: 294
Likes: 0
From: Orlando, FL
What most most radio guys do is a a wire from battery to rear or side firewall with a large inline fuse and fuse block they normally mount any run caps in trunk near the amps. In this case I would probably leave the fuse under the hood and run a wire to the cap / relay in cab either under seat or in center under radio. That way it is just a short run for a ignition power for relay from the fusebox. Since the compressor is located behind driver side seat putting the relay box/cap there and straight down to compressor.
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
probably a day late and a dollar short on this one but while rooting around I found this on the backside of my under hood fuse/relay panel on my '06. Yours may be similar:
Heres a better shot of the location. I took picture standing beside truck. I had unclipped the box (there is a tab at each of the four corners) and lifted it up and forward:
The connection is protected by this little clip on cover:
The connection at this nut is hot all the time (non-switched). I suspect there is a fusable link or some circuit protection between it and the battery but I don't know for sure.
Heres a better shot of the location. I took picture standing beside truck. I had unclipped the box (there is a tab at each of the four corners) and lifted it up and forward:
The connection is protected by this little clip on cover:
The connection at this nut is hot all the time (non-switched). I suspect there is a fusable link or some circuit protection between it and the battery but I don't know for sure.
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