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Old 01-22-2014, 08:25 PM   #1
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starter turns when jumped, wont turn by key

Good evening everyone,

i just finished swapping engines in my 90 YJ 4.2 nuttered. it had a 258, so that's what I put back in. THe engine runs fine, but I am having trouble with the starter. The starter worked before the swap, and does now if i jump the terminals. The engine fires right up when I do that. However, if I try to crank it using the key, nothing happens.

Sadly I am not where the jeep is, or I could post pics.

I thought I hooked it up exactly as it was, but I see now that I've got two black wires with eye connectors on them. I don't remember what they came off of. They hand just above the starter, ro the right of the battery. Could that be part of the ignition circuit?

Can anybody point in the right direction, or better yet have a wiring diagram or picture?

Also note that I currently have the oil pressure sensor disconnected, as well as computer controlled sensors, but I can't imagine that has anything to do with it. The engine starts, just not by the key.

Thanks.

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Old 01-22-2014, 08:34 PM   #2
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The solenoid that is on the firewall. Has two studs out each side as well as two male spade terminals in the middle facing forward.

The stud on the left receives the power cable from the battery as well as 2 other wires. 1 powers the rest of the vehicle and the other is power coming in from the alternator.

The stud on the right side is the power cable going down to the starter.

The 2 in the center have female spade terminals on them, the one on the left comes from the starter relay(ignition/key) and the one on the right gives a signal to the alternator that power is being used.

That's the best that I can explain it, so that its easy to understand. If the wires have a ring terminal on them, they go to the left stud terminal on the solenoid.

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Old 01-22-2014, 08:37 PM   #3
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And if you have it nuttered, then you have taken the computer out of the loop, so disconnecting the oil pressure and other sensors doesn't matter.
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Old 01-23-2014, 12:18 AM   #4
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On a 1990 YJ 4.2 that's Nuttered you can still use the OEM sending unit for the oil gauge, it has nothing to do with the OB1, and it also has nothing to do with why it don't start.
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Old 01-23-2014, 08:26 PM   #5
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I had a loose bolt on my starter in the bell housing. I mean barely loose. It was the upper bolt that you can see from the rear facing forward. The threads in the starter were slightly stripped and it was grounding properly. New starter fixed it.
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Old 01-23-2014, 08:40 PM   #6
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Sounds like a bad ground between the engine and frame/body, or bad connection to the battery. Maybe a bad battery.
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Old 01-25-2014, 11:40 PM   #7
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Figured it out. Down near the solenoid was this funny boot shaped connector. Next to it was a single female tab connector. Plugged the boot into the left side of the relay and the single to the starter tab. Fired right up. Thanks OIIIO for pointing me to the relay.

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