Here is the diagram for the alternator.

 

Is this for the 4.0L ?
Or, are the 4.2L and 4.0L the same ?
The reason I ask, I noticed the ASD circuit. I would think a carburetor doesn't have a ASD.

 

Yes, that's the wiring diagram from the 95 4.0. and no your '89 does not have an ASD.

Hard to tell where those wires run from in your pics. If it the green and orange wires go to that plug in pic 2 they go to a valve on the A/C drier if you had A/C. The wiring harnesses came prewired for all the bells and whistles like A/C so it could be added as a dealer option, and if you have no A/C it is not needed.

Your Alternator should have two heavy (10 Ga or so, Red wires and one 16( brown resistor wire). which I can see below what you are holding in pic1. Easiest way to check your alternator output is to check the battery voltage key off/engine off, then again with engine on. With a good battery and a working alternator you should see 12v/13v off and 13v/14v when running. You get the Idea. The voltmeter doesn't measure alternator output, just battery voltage. with a 30 yr old calibration on the meter, it is what it is and is basically enough to let you know if its working or not.

 

As far as I can remember the field wires are green/ orange and green. Should be in a plastic 3 wire connector that contains ground and both field wires.

 

As far as I can remember the field wires are green/ orange and green. Should be in a plastic 3 wire connector that contains ground and both field wires.

View attachment 4439352

Bronco Billy's '89 s/b old school Three wires as stated above....Unless there's been some swapping going on. s/b running internal regulator with the nutter, No ASD or ignition computer controlling voltage. the little green and black in line wire connector is a resistor plug that eliminates the engine run on when switched off...

 

Thanks guys....y'all rock !

 

look at the A/C wiring diagram for your '89 with A/C. the orange and lt. gr wires go to to the low pressure switch.

 

Thanks !
Every thing was unplugged, or burnt when I bought it. Thats why I'm wondering about every little thing. The factory carb caught fire and melted a bunch of stuff. Lucky for me, it was pretty much all the emissions related components and wires. I don't have A/C, so I'm good there.

 

Thanks !
Every thing was unplugged, or burnt when I bought it. Thats why I'm wondering about every little thing. The factory carb caught fire and melted a bunch of stuff. Lucky for me, it was pretty much all the emissions related components and wires. I don't have A/C, so I'm good there.

If you are ever thinking about installing A/C leave that in, If not, you can trace it out and remove them. With the HEI, if your engine runs on for a moment after turning the key, throw one of those inline resistors in. I never had a problem with it until I did my dual battery setup, then it became a recurring thing until I installed the jumper.

 

What is that part called that is in the red square. My jeep does not have one, and I’m having problems with my alternator. Want to get it back to stock. Thxs.

 

Welcome to the Forum @Gmanhall07

If you start a new thread about your specific problem it's more likely you'll get more specific suggestions.

Here's a thread that we often refer new members to.

A better way to get help in the YJ Tech Forum

Originally posted in the General Discussion Forum by NonRubicon in May 2014. It's every bit as relevant today as it was then. ....................................................................................................... I think there are a few things members here can do to help...

www.wranglerforum.com

Good Luck, L.M.

 

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