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Old 10-20-2013, 06:49 PM   #1
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Fried My Mother-in-laws Jeep

My in-laws were complaining that their battery was going bad. I told them to take it to Advance Auto Parts so they could put it on their machine to diagnose if it is the battery, the starter or alternator. My FIL, the Polish Mechanic, said he knows a bad battery when he sees one, just buy him a new battery & put it in the Jeep.

So, since I'm still working off my debt to him, he did after all give me his first born daughter, I bought a new battery and put it in. No problems with the removal or the install. Once it was installed, I opened the Jeep to start it and test the install. The interior lights came on so I know that the battery was good.

Next, I started the Jeep. It fought starting, the starter made some crazy screams and I heard my wife say that there was smoke coming out from the engine bay by the battery! I shut it off, grabbed the fire extinguisher and ran to check. There was some smoke coming from the starter area the smell of burning plastic. There was not a lot of smoke and it quickly dispersed.

What do you guys think? Fried the starter? Bad ground wire some where? I double checked the battery connections and they were tight & clean. I unhooked the battery & now have to tell my MIL that she has no way to get to work tomorrow. That is, unless she wants to borrow my Jeep! I don't know if she can handle the 32x11.25s & lift.

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Old 10-20-2013, 07:11 PM   #2
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starter was going bad, killed old battery
new battery killed bad starter

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Old 10-20-2013, 07:44 PM   #3
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starter was going bad, killed old battery
new battery killed bad starter
+1
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Old 10-20-2013, 07:46 PM   #4
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At least it want your fault new starter and good to go.
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Old 10-20-2013, 07:51 PM   #5
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Yup, that's gonna cut into my MNF time though!

I hope MIL's gonna be making hoagies!!!
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Old 10-20-2013, 08:11 PM   #6
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make sure you had the battery cables on the correct posts
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Old 10-20-2013, 08:35 PM   #7
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make sure you had the battery cables on the correct posts
Seriously?
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Old 10-20-2013, 09:59 PM   #8
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Seriously?
Yeah. I bought a new battery for my lawn tractor, put it on not even thinking to look at the posts. The one i had bought had the posts on the opposite sides. Hit the go button, the starter started making all kinds of racquet then just stopped. Lucky there was an in line fuse that popped and i didnt cook the starter
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Old 10-20-2013, 10:28 PM   #9
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I wonder if somehow the posts on this battery are marked incorrectly?
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Old 10-20-2013, 10:41 PM   #10
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It's going to either be 3 things, my $.02 1. Battery terminals are switched backwards on battery. 2. The wires going to starter are either loose on starter or burnt in two. 3. The Starter went out and time to buy a new one. Also With jeep in park and Not in gear You can run a hot wire from battery + to starter+ to see if starter is bad to test it, and that will skip wires going to starter.
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Old 10-20-2013, 10:44 PM   #11
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Side note, one time I also had battery terminals switched on battery and it burnt my starter wires up and started screeched as well on a Pontiac grand-am I had, starter was ok.
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Old 10-21-2013, 10:12 AM   #12
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Seriously?
I was dead serious..it has happened thousands of times
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Old 10-21-2013, 10:47 AM   #13
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not all batteries have the + post on the same end..I doubt that the battery has the posts labeled wrong
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Old 10-21-2013, 11:46 AM   #14
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The interior lights wouldn't come on if the posts were swapped. Unless someone bypassed the fuse box.
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Old 10-21-2013, 12:44 PM   #15
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light bulbs don't care which way the voltage is flowing
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Old 10-21-2013, 01:37 PM   #16
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light bulbs don't care which way the voltage is flowing
Exactly. When it is flowing. Swapping the terminals will blow the main fuse, which is designed to blow if the polarity is reversed. (Unless the fuse box is bypassed, as I stated.)
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Old 10-21-2013, 01:41 PM   #17
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Well Yahaha? Were the cables switched?
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Old 10-21-2013, 01:42 PM   #18
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What do u mean working off your debt to him.

Shouldn't he be paying u to take his daughter. Dowry!!!

My F I L was thankful.
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Old 10-21-2013, 01:52 PM   #19
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Exactly. When it is flowing. Swapping the terminals will blow the main fuse, which is designed to blow if the polarity is reversed. (Unless the fuse box is bypassed, as I stated.)
you may be right but I never saw a fuse that cared which way the voltage was flowing either
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Old 10-21-2013, 02:21 PM   #20
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you may be right but I never saw a fuse that cared which way the voltage was flowing either
There is a diode that only conducts when the polarity is reversed and blows the fuse. In theory. Either way, you'll smell something if you connect it up wrong.
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Old 10-21-2013, 02:26 PM   #21
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There is a diode that only conducts when the polarity is reversed and blows the fuse. In theory. Either way, you'll smell something if you connect it up wrong.
okay..mine don't
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Old 10-21-2013, 08:11 PM   #22
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Well Yahaha? Were the cables switched?
I always double check the battery before I tighten down the battery hold down. And then check again before I connect the new battery.

My FIL confirmed that the wires were never switched. And since I was the person who removed the battery, I noted which way the old battery was connected. Took a pic with phone just to make sure.

I just found out that the starter has been going bad for a number of months now. Not surprising that it went out with the new battery. Would it matter that the batter has 800 cranking amps?
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Old 10-22-2013, 12:28 PM   #23
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Took a while to clean the corrosion off the starter wire contacts...

DONE!
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Old 10-22-2013, 08:46 PM   #24
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Yeah. I bought a new battery for my lawn tractor, put it on not even thinking to look at the posts. The one i had bought had the posts on the opposite sides. Hit the go button, the starter started making all kinds of racquet then just stopped. Lucky there was an in line fuse that popped and i didnt cook the starter
Reverse pole battery. My RX-8 takes one.
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Old 12-02-2013, 11:46 PM   #25
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Japanese way best way.

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