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Default Re: Ford F250 Wiring Help

I'll Chime in here. It does not matter what color wire you use but as a reference I like to keep red + and Black - or whatever color wire I have left over from Other projects lol. as for the 5 amp circuit for the switch to the horns, I would run a new wire from B + into the cab with a fuse on it to the switch then from that to the horns. as for your Ignition Positive and depending on if you have large fuses or mini, I would use whats called an "Add a Circuit"

https://www.amazon.com/SpyTec-Hardwi...003202&sr=8-11

Use a Volt meter or test light and see what fuses are Powered "On" when the key is in the Run position. run that to your pressure switch then from your pressure switch to pin 86 on a RELAY

https://www.amazon.com/Ehdis-Relay-4...0003309&sr=8-9

^^^ Like that. You will also need to run a 30 amp fused + wire from your battery to Pin 30 on your Relay, Pin 85 Ground, Pin 87 To your Compressor. Find a metal surface to use a self tapping screw and ground your compressor, Relay, and Horn solenoid. Questions? Don't hesitate to ask. we are here to help
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1998 Chevy Tahoe Ex Cal Fire Truck. Horns... Soon.

2010 Marin Bicycle w Torker Bicycle trailer, Grovers 1045 and 1042. 120 psi. Delco Remy Stock horns on Handlebars. TYC Alternator, York 210 (Both Pulleys turn with wheels. Centennial Car Battery for power.

2000 Honda Accord. Nathan Airchime K3HA, 7 Gallon tank, Vi-air 280-P and Vi-air 380-C, Denso 130 amp alternator from Junk yard Honda Odyssey.
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