Need help to find a key hot wire for my holly fuel pump. Am using a toggle switch under the hood and it is a pain. Where and what color is the easiest wire to hook up to? I would like to hook up to the factory lift pump wire but to dumb to figure it out. Thanks LeRoy

 

Use a relay, connect the 12v source to the battery, inline fuse, relay, to the holley, then use the hot wire for the stock fuel pump to trigger the holley.
Ill be doing the same thing in a month or so when I get a fuel pressure guage

Ill see if I can get a wiring diagram.

EDIT: Shouldnt the 03/04 trucks only have a power/ground in the LP harness, since its engine mounted, not intank like the 05+s?

 

LeRoy:

Hey buddy, my apologies to you on that hot wire! My buddy (Dodge Tech) at our dealer was out of town and I could not get an answer from the "gas techs" at the same dealership! Sorry to leave you hanging!

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John_P

 

on my truck empty fuse # 37 is hot with the key on only.