Novak Conversions Jeep Wrangler TJ engine mounts

Battery terminal contacted edge of tub, TJ exhibiting weird driving behavior afterwards

GregBelleville

TJ Addict
Original poster
Supporting Member
Joined
Sep 19, 2022
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Location
Southern California
Saturday I was wheeling in the local mountains and had an issue where my battery shifted and the positive terminal made contact with the edge of the tub.

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When this happened the motor died and wouldn't turn over at first when I attempted to restart it. After opening the hood I noticed it had shifted and realized what happened. I moved the battery around by hand and immediately my under hood light came on, so I tried the key and she fired right up. I got the battery strapped down better, but I had this no crank situation occur a couple more times on the trail, but each time I was able to jiggle the battery a bit and all worked well again.

Once we finished the trail I was gassing up and I got another no crank situation. This time, the lights and radio worked but the starter wouldn't work. I'm guessing the damage shown above to my terminal connector was leaving an intermittent connection that was good enough for lights/radio but not enough juice to power the starter?

After doing more wire and battery jiggling, she finally fired up and I promptly left to head down the mountain because there was a wildfire in the area and roads in/out were starting to get shut down.

I immediately noticed that the Jeep was down on power, I could put my foot to the floor on a downhill grade and it was not accelerating just holding right at 45 miles per hour. I was getting nervous because of the fire so I just resolved to drive it as far down the mountain as I could get, and if she broke down on me, at least I'd be closer to services. After I'd say about 30 minutes the issue went away and normal power seemed to return, I got down the mountain and jumped on the freeway going 70 no problem.

Does anyone have ideas on how the battery terminal issue may have caused the problem with the motor being temporarily down on power? It almost seemed like the Jeep was in some sort of limp mode maybe, but no codes were thrown.

And yes, a proper battery hold down clamp along with a new battery terminal are on my shopping list. 👍

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Have you gone through all you're wiring yet? See if something burned up down the line somewhere?

So far I have pulled the battery out and looked over the wiring to the starter, and didn't see anything obviously damaged. I'm hoping/guessing that a new terminal connector will be all I need to be back up and running

I'm not very knowledgeable about electrical stuff, so I'm hoping someone has an idea what would cause the motor to be down on power temporarily like it was after this battery issue.
 
@GregBelleville I can test the pcm with a 1-2 day turnaround if you would like to send it into me.

Thanks Mark, so symptoms sound PCM related? I'm going to try replacing the terminal connector first and see if that resolves everything.

Can everyone please just go vote for my rotm photo so I can get the PCM taken care of? 😂
 
I guess you could try the grounds but I was always told touching the terminals to the body like that could damage the computer. I always go a little extra and use a towel and great care whenever removing a battery terminal.
 
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Good deal I’m glad you’re OK.

You know the thing that this makes me think about is the basics.

Not admonishing Greg.

Mark Smith, legendary trail guy, has a top 5 trail
mistakes list....a loose battery was number 1.

Reminds me to check mine.

You know the top professionals always master the basics-

I needed a root canal one time and the endodontist would not start until the temporary medication wore off and he could test my teeth-

I was like sir what is the deal?!?

He said son I’ve got to get the right tooth- the basics.

I’ll give you another example- Motocross tracks.

No, I’m not a big motocross guy- always rode the woods, but you know what the first thing you do when you get on a motocross track is? Turn on the gas. One of the last times I was at a track a guy had a broken leg because the bike ran out of the fuel in the line on a jump face.

Trim carpenters- first thing they do when they pick up a gun is check the nail length.
 
Novak Conversions Jeep Wrangler TJ engine mounts