One stupendously dumb mistake - JeepForum.com
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post #1 of 32 Old 02-01-2021, 02:21 PM Thread Starter
fig
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One stupendously dumb mistake

Ok, So I bring my dead battery to Wally World to trade in for one that isn't dead. I have put a set of the 2-pack green & red felt battery terminal thingies with it as I have none. I am not really watching the guy closely when he open the pack and puts them on the battery. I get out and go straight home. Now, before the old battery died this Jeep, which had been sitting for over a year started right up and ran great.
So, I hook up the new battery I noticed a spark out the side with the starter, but there is no way I could see what is was because it happened quick...and was over. I disconnect the battery and after I have a look around hook the battery back up and now the horn is stuck on and so are the headlights. I'm thinking it is because it sat for so long. NOT! So I pull the fuse for it/them.
But now the starter just spins, but it doesn't turn the engine over. I try to jump it, but now this is when I noticed that the guy had put the colors of the velvet "washers" reversed!!!
So, I disconnect the battery, reverse those felt "washers" and start over.
Now the starter turns and it engages the engine, but no matter what...it will not start now.
1st Question: Any idea as to what the spark from the general vicinity of the starter was?
2nd Question: Will a diagnostic tool tell anything if the engine cannot start or is not running?
3rd Question: How do I trouble shoot what is happening?


Any help would be greatly appreciated!
Thanks!

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post #2 of 32 Old 02-01-2021, 02:32 PM
xjpete
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Did you check any fuses? Did you have any wires touch metal which would have caused it to spark? Look and see if you can get it jump started. I don't think those red and green washers would have caused any issue, as they just help with corrosion supposedly. I worked with a guy who thought his battery was bad so he got another one at the auto parts store. The car wouldn't start so he went back and cursed out the guy at the auto parts store, his girlfriend kicked over a display in the store. She was arrested, he was told never to go back in the store. Turns out a fuse was blown and after it was replaced, the car started. Strange but true story.
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post #3 of 32 Old 02-01-2021, 03:07 PM
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Quote:
Originally Posted by xjpete View Post
. . . I don't think those red and green washers would have caused any issue, as they just help with corrosion supposedly. . .
Unless, instead of looking at the terminal posts or the markings on the case, you rely on them for polarity & connect the battery the battery round the wrong way.

The starter might've survived going backwards (that's why it spun, without turning the engine) - but not so sure about the, albeit limited, electronics.
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post #4 of 32 Old 02-01-2021, 03:19 PM
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Then he should look at fuses to see what is blown.

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post #5 of 32 Old 02-01-2021, 03:41 PM
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First, what Jeep are we working on, is it the 2000 XJ or something else?
I'll assume it's the XJ

Yes check the fuses, then check for spark, if no spark, then you have to diagnose the
ECU, crank/cam sensors there is a good chance one or all of these where damaged.
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post #6 of 32 Old 02-01-2021, 04:25 PM Thread Starter
fig
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Ok, yes, I went by the color of the felt washers instead of the polarity makers on the battery itself. Me=idiot. I really can't believe i did that, but i did, no one else I can really blame which makes it even worse.
Where it is now is that the engine was turning over great, but just would fire. I will be pulling and checking fused tomorrow. I am wondering if there are any fuseable links that I might have popped?
Damn shame this happened because even though I wasn't using it, it ran incredible. I had changed the head to one of the TUPY (?) heads as the old one finally cracked all the way.
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post #7 of 32 Old 02-01-2021, 06:08 PM
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fig-happens all the time to people. Last summer the battery in my Kawasaki street bike needed to be replaced. The terminals are the opposite on some model batteries. + on right, - on left, this one had the - on right and + on left. I hooked up the battery, hit start button and then heard a pop. A fuse was blown. Thank goodness I realized what I did, and went and got a battery with the terminals the correct way as the positive cable don't stretch on those. Lesson learned-bet its a fuse.
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post #8 of 32 Old 02-02-2021, 11:50 AM Thread Starter
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So, ECU, crank/cam sensors, this is two separate parts...or more than two?
Thanks!
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post #9 of 32 Old 02-02-2021, 01:45 PM
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I wouldn't have thought a fuse would care which way the current flowed through it - after all, they're not directional or relays (a common cause of XJ's not starting) for that matter & a starter's a tough old bit of kit & will survive some abuse but electronics are a very different matter. ECU, crank position sensor & cam position sensor are all different parts - & there are a few others.

A diagnostic tool must be able to pull codes even if the engine's not running, otherwise you couldn't diagnose non-starters.

There is a fusible link; it's the light green wire at the front of the underhood fusebox.
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post #10 of 32 Old 02-02-2021, 04:08 PM
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I would be concerned about that spark the OP said came out by the starter. Look for burn marks by the starter. I think they can be tested at an auto zone or good auto part stores. OP fig did you crank it over several times before you saw the mistake? If so could have damaged more things but still saying fuse, or now fusible link or starter.
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post #11 of 32 Old 02-02-2021, 04:59 PM
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Check for codes first. It the ECU is damaged that would show up as an invalid or missing reading.

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post #12 of 32 Old 02-02-2021, 05:09 PM Thread Starter
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Oh yes, I cranked it quite a few times as I still had no idea the thing was reversed and not even suspecting that. It was actually one of those small jump started devices that tipped me off. It had a constant beeping sound which was a code for it being improperly connected. It looked right to me, but when I looked more closely I discovered my [email protected]$$ mistake. As I go through the discovery process I'll provide an update or updates. Who knows, maybe I'll get lucky!
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post #13 of 32 Old 02-02-2021, 05:46 PM
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My younger brother(53) always wanted to help me on my vehicles. One day while working on my XJ, he took a brand new Snap On wrench and dropped it by the battery. I saw sparks and the wrench actually split in half. After removing it with welding gloves, battery simply worked after I cleaned up everything. I have also used batteries to weld things-kind of scary but gets the job done.
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post #14 of 32 Old 02-02-2021, 08:00 PM
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OP stated the engine now turns over with the battery connected correctly.

Again, check for spark at the plug. Is there spark when then engine turns over?
Electronics do not like to be connected backwards, I believe the ECM may be fried.

As for the spark at the starter, it should be fine as it turns the engine over now.

Whats over that next ridge?
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post #15 of 32 Old 02-03-2021, 07:08 AM
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and one positive from all this, fig, is that you will never mis-wire a battery again. i know, i have done it also and one time was all it took to make sure it never happened again

the xj is the only jeep left in the driveway
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