My 84 Pickup hasn't been starting if I leave it for a couple days, and my Optima Yellow Top finally called it quits (died too many times I think). Last weekend I charged it, and yesterday was the first time I tried to start it... no go, it was reading 3.5V.

So today I bought a new Diehard Platinum AGM, and don't want to kill it, so I need to figure out this parasitic draw condition that I have.

I did the ammeter test and pulled fuses 1 by 1. The parasitic draw is .17A. When I pull the 10A "Hazard/Horn" fuse in the under-hood fuse box it drops to .03A, so that is the problem.

I was thinking if I went to the end of each circuit run and disconnected it, I could find what run the problem was in and trace it back connection by connection until I found the problem. Apparently that isn't how it works because I unplugged each turn signal (hazard light) and disconnected the horn and that didn't reduce the draw.

Does anyone have the wiring diagram for this circuit, and what should be my next step in tracking this down? Its probably a corroded connector or something, right? So just disconnect each one until the draw goes down?

Any input would be appreciated.
Thanks!

 

In this circuit does it all work like it should??

all the lights flash that should with no extras??

The horns blow like they should there should be two but who knows with something this old.

Does this have the radio presets power run off the hazard/horn fuse.

I wish I had the EWD for this but I don`t.

 

Actually no, Although all of the turn signals work, only the fronts flash with the hazards. The stock lights are long gone though, they are trailer lights.

No, the radio presets don't run off this fuse, I've pulled the fuse several times, and the presets are still good.

 

UPDATE: I am making progress, I pulled the wiring harness connectors in the under-hood fuse box and checked each pin. I found the wire with the parasitic drain.

The clean red 10A fuse in the photo below is the Hazard/Horn fuse, the Green with White Stripe wire is the circuit that contains the draw.


A wiring diagram would be helpful now to see what that green w/ white wire goes to exactly.

 

OK, I found out auto zone members have access to wiring diagrams, so I signed up. I found the Hazard/Horn fuse on the 84 Pickup diagram.... funny thing is there is no Green w/ White wire running to it. Well thats odd... but the previous owner did a motor swap from a 88 4Runner, so I looked up that diagram, and the Hazard/Horn fuse has a Green w/ White wiring running to the turn signal flasher, then directly to ground, so my problem must be in there... I think.

Lets go see...