On battery hookup truck cranks no key in?

[Hardracer]

I threw this question to an old timer here at work....I didn't even finish getting the question/problem out he blurts out check the solenoid or he said sometimes the battery cable on the starter near that s terminal could be touching....
All I got to offer...lol

 

[lance1586]

Did my due diligence, sort of, and replaced the starter relay. No change as soon as you touch the ground cable to the battery the starter starts to engage. . . So; guess I’m chasing a shirt in one of those wires then?

 

[RamDiver]

Did my due diligence, sort of, and replaced the starter relay. No change as soon as you touch the ground cable to the battery the starter starts to engage. . . So; guess I’m chasing a shirt in one of those wires then?

Have you removed the wire from terminal S on the solenoid yet and then reconnect the battery?

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[lance1586]

Replaced the starter solenoid and it’s still grounding and trying to engage the starter. So off I go to try and run down this short which I don’t really know how to do other than visually inspect every mm of the wires?

 

[lance1586]

Yes I did so guess it’s the main power supply that’s shorting out

 

[RamDiver]

Yes I did so guess it’s the main power supply that’s shorting out

I posted the schematic drawing so you could see how incredibly simple this starting circuit is. That's about it, no hidden mystery power supplies.

If you don't understand something in the circuit diagram, please ask.

I'm doing my best to help you but I need your assistance and cooperation because you're closer to the truck.

I've asked 3 times, all the way back to my first post and still have yet to get an answer.

Here goes for the forth time.

Have you removed the small gauged wire from the S terminal on the solenoid and then connected the battery?


PS: Be sure insulate the wire or lug from the S terminal after disconnecting it. From the information you have provided, that wire may have 12 volts at all times.
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[lance1586]

Yep, unhooked the ignitio wire from the starter. Still wants to crank. So, I’ve replaced the starter, starter relays and unplugged the ignition switch (the big C shaped plug) under the column and it’s still arcing and wants to crank.

 

[lance1586]

Sorry I’m working and navigating this site from a 4” iPhone it’s not optimal for being on a forum but it’s what I can use when I’m working. I wasn’t blowing you off and unhooked the ignition wire from the starter and it still shorts out. So, I put a magnum starter on it. Still shorted, then did the starter relay, still shorted, then I unhooked the ignition wire from under the column still shorting. I’m out of time to mess with it for now leaving for Tulsa in the am. It’s gotta be a dead short in the main power supply line to the starter. I know it’s a simple system and am clear on its function. Just replacing stuff as it can’t hurt anyway. I’m out of compliments to replace now and it’s time to find my shirt in the wire.

 

[lance1586]

Running out of components; not compliments Lol!

 

[RamDiver]

So just to be clear, there is nothing connected to the S terminal on the solenoid and it cranks immediately, when you connect the battery?

The two large binding posts on the solenoid are simply acting as a switch to deliver 12v from the battery to the starter.

One side is connected directly to the battery and the other to the starter.

If there is nothing on the S terminal and the two large binding point are not bridged or shorted together, the next step would be to trace the large wire between the solenoid and the starter and try to determine how that wire is receiving the 12v power.

Forget about some shorted main power supply, it doesn't exist. The diagram is more or less all there is for the starter system.

These trucks have lots of complexity but not with the starter circuit.

Could you post a closeup picture of the solenoid terminals?

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