[davesaudio]

1998 F150 4x4

I've narrowed down a 5 amp draw (engine off) on a tan? 14Ga-ish wire connected to the alternator side of the 175A fuse. Can anyone tell me what circuit that wire supports?

Too freaking cold to spend a lot of time out there...
3-4 hours and the battery is toast if I don't pull connectors
Dave

[electro]

I wonder if it goes right back to the Alternator Regulator on terminal A?

[davesaudio]

Thanks for the quick response.
I just replaced the alternator and battery.
Unless the reman unit is NG too...
thinking...

[Poppy]

If you don't have a owner's manual, you may obtain one here.
https://www.flmowner.com/servlet/Con...uideSearchPage

[davesaudio]

So it looks like the problem is the ignition switch or something odd in the inst cluster.
The path that supplies the alt-light in series with the (field?) is never switching off.
Pulling the 10A mini fuse downstream (position 19) kills the current.

[electro]

With the Alternator unplugged, and the Ignition Switch off, do you still have power at fuse #19?

Yes, it might be the ignition switch, or Alternator, or ... hmmmm .... could it be an aftermarket installation that is feeding back?

[davesaudio]

Ah, I like your logic process Factory orig wiring BTW
The good news: The GEM and the fuse panel look OK, but
my earlier analysis wasn't exact.
The ignition switch side of fuse #19 has a +12v state(good) and a resistance to ground state(WTF). Must be the ignition switch contacts.I've stuck a relay in series with the fuse, we can think about this again when its warm...