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Unread 06-01-2012, 10:24 AM   #1
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1998 TJ Wrangler 
Join Date: Nov 2011
Location: Midland, Tx
Posts: 278
Ignition Wiring CJ2A

I have a 1948 CJ2A that I am trying to make the engine run. The jeeps wiring has been totally gutted because it was a cobbled mess. I am trying to make sure I have the bare minimum wiring just to get motor to start. Based on the picture I drew in paint is there anything missing if I jump the solenoid and apply the power to the ignition circuit the way it's laid out.

Notes: The jeep is converted to 12v but the ignition is still 6v to my knowledge. The ballast resistor is there to knock the voltage down for the 6v coil.

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Unread 06-01-2012, 12:29 PM   #2
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1951 CJ3A 
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Location: Littleton NH
Posts: 663
Looks pretty good to me. Just "bump" the starter over and see if its getting spark at the plugs.

Here is a full diagram for when you redo the rest of it
Originally Posted by RubiconRazorbac View Post
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But I'm sure someone out there will post that they regularly eat turd sandwiches with no problems...
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Unread 06-02-2012, 05:52 PM   #3
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If that's a ground wire from the battery to the coil, you don't need it. First, the coil's body does not need a ground, and second, if you have it attached to the negative post on the coil, it won't spark.
The coil negative should only have the wire from the points to it. Sometimes a tach will hook there too, but if not running a tach, the distributor wire is the only one.

And just in case you're starting from scratch, the largest battery cable from the negative side goes to the engine block, while another smaller jumper should go to the body. And even one to the frame if you have that option. If not, jumpering ground wires/cables/straps between the engine and body, engine and frame, and anywhere else you care to put them, can make for a much better performing electrical system.

Good luck.

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Unread 06-05-2012, 08:22 PM   #4
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1998 TJ Wrangler 
Join Date: Nov 2011
Location: Midland, Tx
Posts: 278
Thanks for the help guys I wired it like in my first picture without the wire from the coil to the neg battery terminal. I got it to run for all of 10 seconds and it idles rough but when I revved it up it smoothed out until 1500-2000(W.A.G) where it seemed to stall out and then die like it ran out of gas. But bottom line it ran. Thank you guys. Now it's time for tear down and rebuild of the whole jeep.
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