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Old 01-16-2017, 12:48 AM
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Join Date: Oct 2016
Location: Denver
Posts: 70
12v power source

Looking for a 12 v power source which will be present even during cranking.

I have an 89 4.2 with a manual transmission. I installed the Howell TBI, the ECM requires current when the ignition key is in both the crank and run position.


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Old 01-16-2017, 01:10 AM   #2

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Join Date: Jan 2014
Location: SouthEast of Denver
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If you have a Factory Service Manual, there is a schematic under electrical troubleshooting. There is a page labeled "starting circuit" (or something close to that).
You will be able to see which wires are hot in both positions.

If you don't have a FSM, find a post by MudMagnetYJ and he has a link to several in his signature.

Good Luck, L.M.

"Wrangler....It's not just a vehicle, It's a lifestyle".
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Old 01-16-2017, 07:23 PM
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Join Date: Oct 2016
Location: Denver
Posts: 70
I do have the factory service manual. I found under "Ignition switch" there is a 14 gauge wire which comes off the run/start position. I found it on the fuse panel under "ignition/Lmps" 15 amp. I did a fuse tap there, and it works perfect.
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