No crank, no start, and I'm out of ideas

[GATORB8]

I apologize for not getting back to this thread I have been out of town for work.

recap of where I am at.
On the Engine Starter Motor Relay socket
Jumping socket 1-2 starts the Jeep (not 3-5) which was posted above.

Test #1 B5 to ground yields 9.5 -10.2 v on key cycle

Test #2 12v between socket 1-2 Result 12.6v all the time before key turned. After key turned 12.6v Switched relays and no change in behavior.

Test #3 B3 to battery positive Result is 12.6v

B3 to ground fails continuity test and B3 to G105 fails continuity test. I cleaned G105 and same result

I believe you are saying that it lies in connector C154 on top of the transmission. I unplugged it and plugged it back in. There is no visible damage.

"That leaves C154 where pin 1 and 3 should be jumped on the trans side" Sorry not following this I am not sure what you are saying here. I see what you are referring to in the wiring diagram. "Manual Transmission Jumper" on diagram 8Wa -15 -12


Any ideas for my isolating and what is my next move? test C154 to G105?

Super appreciate the help. BTW he scored 100% on the driving test.

You should be good on test 3, because if you are getting 12V, it's finding ground somewhere.

Hmm, this is odd:

I'm not sure what the bare minimum voltage to fire the relay is, but if this is under what it needs to fire it would keep the relay from working. Which would cause your issue.

Since you bypassed the clutch safety switch, I'd expect that input is running:
1. Fuse 14 30 Amp
2. Ignition Switch
3. Fuse 20 20 Amp
4. Relay Input

Check what voltage you are getting at F14 and F20. I wonder if there is some voltage drop happening at the ignition switch. If you have 12.6 at F14 and 9.5 at F20, it'd definitely indicate something happeining there. F14 can be tested without the switch, F20 would be hot in start.