Upfitter Switches
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Junior User
Joined: Jul 2001
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Thanks. What I am trying to do is wire some PIAA fog lamps to an upfitter switch and wondered if this could be done totally in the engine compartment. Or would I have to pass the power wire through the firewall to connect to the upfitter wire.
Hotshot
Joined: Aug 2006
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From: Whittier, CA
The problem with the pass-thru wires, is they are only big enough for the 10A upfitters. Ford should have given us two 16ga, and two 12 gauge, but they didn't. Your lights probably draw too much current to use those wires.
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Could always use the supplied relay and then the wire won't be a factor.
Hotshot
Joined: Aug 2006
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From: Whittier, CA
Yep, and use one of the low current upfitters.
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Fleet Mechanic
Joined: Apr 2007
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From: NH
Do as Ryked said,
Wire from upfitter switch (firewall feedthru) will turn on your relay (coil). You don't have to fuse this point but make sure your wiring from the lights to the battery (or convienient source with adequate current capability) is large enough, 12 awg or better and that this point is fused.
Wire from upfitter switch (firewall feedthru) will turn on your relay (coil). You don't have to fuse this point but make sure your wiring from the lights to the battery (or convienient source with adequate current capability) is large enough, 12 awg or better and that this point is fused.
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Junior User
Joined: Jul 2001
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This is what PIAA told me to do; does it sound right? If so, which upfitter switch is correct, 10A or 30A?
Thanks
"All you do is cut the switch off and take the red wire and hook it up to the up fitter switch. Ground the black wire and do not use the white wire".
Thanks
"All you do is cut the switch off and take the red wire and hook it up to the up fitter switch. Ground the black wire and do not use the white wire".
Hotshot
Joined: Aug 2006
Posts: 17,398
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From: Whittier, CA
Maybe someone who knows about the specific PIAA product can help. I don't know their product.
Is there a relay included? How many amps do the pair of lights draw?
Your upfitter #1 and 2 are 30 amp, and #3 and 4 are 10 amp. The wires that pass through the firewall are only heavy enough for the 10 amp switch. The 10 amp switch is all you will need, IF you are using a relay. But their instructions do not sound like a relay, because it would need a current source other than the upfitter switch.
Is there a relay included? How many amps do the pair of lights draw?
Your upfitter #1 and 2 are 30 amp, and #3 and 4 are 10 amp. The wires that pass through the firewall are only heavy enough for the 10 amp switch. The 10 amp switch is all you will need, IF you are using a relay. But their instructions do not sound like a relay, because it would need a current source other than the upfitter switch.
Hotshot
Joined: Aug 2006
Posts: 17,398
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From: Whittier, CA
Sounds like you are new to wiring - so, there are some helpful diagrams in this thread:
https://www.ford-trucks.com/forums/5...with-pics.html
What you are doing is similar, the lights just happen to be on the front instead of the rear.
Also, I wrote this when I installed my upffiters. The second and third photo from the bottom might help you find the wires. http://www.billpounds.com/truck/upfi...rsInstall.html
https://www.ford-trucks.com/forums/5...with-pics.html
What you are doing is similar, the lights just happen to be on the front instead of the rear.
Also, I wrote this when I installed my upffiters. The second and third photo from the bottom might help you find the wires. http://www.billpounds.com/truck/upfi...rsInstall.html
