OT Sort Of: Toggle Switch
Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
I'd use a SPST momentary switch and wire it up to turn on a SPDT 40A automotive relay. You'd have the air dog hooked up on the NC contacts so that when you flip the switch on, it energizes the relay and cuts power to the air dog. If you do it with a switch directly, you'll need to run the power wires for the air dog up into the cab and use a big switch with a high amp raiting. With the relay, you only need small gauge wires to do this, with a light duty switch, and the relay would go where ever the power wire for the pump is, probably down on the frame rail.
Also, the switch you found above will work for the relay setup. I don't think its heavy enough for direct wiring though since that 20A is for 120VAC, not DC.
Also, the switch you found above will work for the relay setup. I don't think its heavy enough for direct wiring though since that 20A is for 120VAC, not DC.
4000 rounds a min
Joined: Apr 2010
Posts: 2,223
Likes: 0
From: Albemarle NC
I'm with Trevor on this, the relay will carry the load much better than the toggle will.
And they make such a thing as a momentary rocker switch that would look a hole lot better than the toggle.
And they make such a thing as a momentary rocker switch that would look a hole lot better than the toggle.
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
I agree with the relay if you are breaking the run circuit and I never found a higher amperage anyway.
But I assumed op was just breaking the fuel pump relay signal or even the crash sensor. Is you ad wired up to the stock wiring?
But I assumed op was just breaking the fuel pump relay signal or even the crash sensor. Is you ad wired up to the stock wiring?
Thread Starter
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you can't fix stupid!
Joined: Mar 2008
Posts: 1,906
Likes: 2
the airdog has a wire harness that draws the key on power from the stock fuel pump....from there it goes up to the relay where the positive and ground come from the battery through the relay and down to the pump....i was going to interrupt the circuit inbetween the key on power and the relay......
Thread Starter
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you can't fix stupid!
Joined: Mar 2008
Posts: 1,906
Likes: 2
here is a little diagram for you:
if i interrupt the circuit inbetween the key on power to the relay coming from the main pump do you think itll work ok or how should i add another relay?
if i interrupt the circuit inbetween the key on power to the relay coming from the main pump do you think itll work ok or how should i add another relay?
Elder User
Joined: Mar 2012
Posts: 609
Likes: 0
Read further... That one is 15A @ 125V, 10A @ 250V. Since power in is equal to power out, that switch should work for at least 30A @ 12V.
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Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
DC creates more heat then AC though, so I doubt it's good for 30 amps.
Bill, that's even easier to do. If you interrupt the wire controlling the air dog relay, you can accomplish what you want. I think in this case you want a SPDT On - mom. on. switch. You'd wire the switch so the air dog relay is connected through the constant on part of the switch and when you flip it to the momentary position, it will break the power to the air dog relay and switch that pump off.
Bill, that's even easier to do. If you interrupt the wire controlling the air dog relay, you can accomplish what you want. I think in this case you want a SPDT On - mom. on. switch. You'd wire the switch so the air dog relay is connected through the constant on part of the switch and when you flip it to the momentary position, it will break the power to the air dog relay and switch that pump off.
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
the airdog has a wire harness that draws the key on power from the stock fuel pump....from there it goes up to the relay where the positive and ground come from the battery through the relay and down to the pump....i was going to interrupt the circuit inbetween the key on power and the relay......
Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
I've been having a hard time finding an on/momentary off switch, which is why I suggested the on/momentary on. Its a double throw switch that doesn't have a center off, so it'll do what you want.
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
since adding my air dog i have noticed on my battery gauge the voltage drops to around 10.5 or so instead of the usual 12 when cold starting....if i sit there and wait for the glow plugs to cycle off the voltage bumps up and the truck starts normally (speed wise) if i dont wait for the gp's to turn off the truck will start but is slow cranking until it speeds up.....
No reason that fuel pump should cause this problem. How old are batts? Terminals clean? 
What starter are you using and how old is it? 
Good advice here, but I prefer the KISS method.
