[Severt]

Hey guys, I have a 2000 7.3 and having a problem with my batteries draining all the time and too low to start my truck after a couple days. Thought it was the starter solenoid, but replaced with a new one and still same issue. Have replaced both batteries 2 times still same issue. Started probing voltages on all posts and found out that there is 5 volts on the "S" wire of the solenoid all the time. When the key is turned over, it does go to 12v, but the batteries drain after a couple days.

Any clue as to where I should look to see where this wire would be getting 5 volts from?

 

[klhansen]

That wire comes from the ignition switch start circuit, thru Fuse 20 the under dash fuse box, a jumper block under the dash where the Clutch Pedal Position Switch would be and then thru the Digital Transmission Range Switch (DTRS) on the transmission to the starter relay. You may have a short between wires somewhere. Or if the fuse box has gotten wet, there could be voltage leaking between traces.

 

[Severt]

That wire comes from the ignition switch start circuit, thru Fuse 20 the under dash fuse box, a jumper block under the dash where the Clutch Pedal Position Switch would be and then thru the Digital Transmission Range Switch (DTRS) on the transmission to the starter relay. You may have a short between wires somewhere. Or if the fuse box has gotten wet, there could be voltage leaking between traces.

OK thank you, I will give it a look tonight!!

 

[STEVE'S OLD TRUCK]

Did you find where the 5 volts was coming from? I have the same issue

 

[klhansen]

Steve, tell us what year/model your truck is. We can get you wiring diagram help, but most likely you have water intrusion in a fuse box that's allowing leakage between an always powered circuit and the start circuit that runs thru the ignition switch.

 

[STEVE'S OLD TRUCK]

Steve, tell us what year/model your truck is. We can get you wiring diagram help, but most likely you have water intrusion in a fuse box that's allowing leakage between an always powered circuit and the start circuit that runs thru the ignition switch.

I have a 1999.5/2000 Ford F350 Powerstroke 7.3. I had water intrusion problems before and it was doing all sorts of crazy stuff. Cranking over on its own, horn going off etc. I replace the windshield two+ years ago and it solved the problem. I did notice that the floor seemed damp. I live in Oregon and it has been raining pretty steady lately.

 

[klhansen]

LOL, Raining in Oregon?? No way!

You will likely find an issue in the fuse box.