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Old 06-03-2019, 08:44 AM
 
Location: Eastern NC
20,870 posts, read 20,772,172 times
Reputation: 18759

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My rear window in my 4Runner would not go up so I took two leads and ran it from the battery to the window motor to raise it back up. While doing this I accidentally hit the wires and shorted them out twice. It totally killed the battery. I jumped it and the 4Runner started right up. I drove it a bit and went to a store, came out and it started right up. 4 days later and the battery is dead again. No lights, no nothing. I put a voltmeter to it and it currently reads .02 volts. Is it safe to say I killed the battery or could it be something else I killed? And why after I jumped was it ok for the day if I did kill it? Thanks.
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Old 06-03-2019, 09:31 AM
 
13,522 posts, read 16,173,125 times
Reputation: 20777
I'd guess the battery was old to begin with, but for less than $100 you can find out (replace it).
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Old 06-03-2019, 05:37 PM
 
Location: SC
8,794 posts, read 6,924,701 times
Reputation: 12919
Quote:
Originally Posted by trlhiker View Post
My rear window in my 4Runner would not go up so I took two leads and ran it from the battery to the window motor to raise it back up. While doing this I accidentally hit the wires and shorted them out twice. It totally killed the battery. I jumped it and the 4Runner started right up. I drove it a bit and went to a store, came out and it started right up. 4 days later and the battery is dead again. No lights, no nothing. I put a voltmeter to it and it currently reads .02 volts. Is it safe to say I killed the battery or could it be something else I killed? And why after I jumped was it ok for the day if I did kill it? Thanks.
Are you saying you touched the two leads together a couple times? Or are you saying you somehow connected the two wires and left them connected for some time. If it is the later, I would imagine you burned out the wires and maybe anything they were connected to, but if it is the former (a spark or two), I cannot imagine it did anything to damage the battery - or anything else in your car.
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Old 06-03-2019, 05:56 PM
 
1,963 posts, read 2,922,169 times
Reputation: 3050
Quote:
Originally Posted by trlhiker View Post
My rear window in my 4Runner would not go up so I took two leads and ran it from the battery to the window motor to raise it back up. While doing this I accidentally hit the wires and shorted them out twice. It totally killed the battery. I jumped it and the 4Runner started right up. I drove it a bit and went to a store, came out and it started right up. 4 days later and the battery is dead again. No lights, no nothing. I put a voltmeter to it and it currently reads .02 volts. Is it safe to say I killed the battery or could it be something else I killed? And why after I jumped was it ok for the day if I did kill it? Thanks.
Check for flaky battery connections.
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Old 06-04-2019, 10:14 AM
 
13,341 posts, read 15,227,297 times
Reputation: 17910
Yank the battery and hitch a ride to the local auto parts store and have it tested.
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Old 06-04-2019, 03:27 PM
 
15,231 posts, read 21,332,150 times
Reputation: 17843
Buy battery at junk yard. They are rather cheap there.
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Old 06-04-2019, 04:43 PM
 
Location: Newburyport, MA
5,770 posts, read 3,088,678 times
Reputation: 7072
When I was still a young-un, I had a Mustang and the battery wasn't held in place by a clamp, and it shifted and the hot post contacted electrical ground on the adjacent fender skirt, and that electrode was vaporized instantly , and I needed a new battery.
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Old 06-04-2019, 05:09 PM
 
33,414 posts, read 30,941,336 times
Reputation: 19951
Quote:
Originally Posted by BostonMike7 View Post
Yank the battery and hitch a ride to the local auto parts store and have it tested.

this. its possible that the connections were suspect to begin with, and when you shorted the battery out, you killed the connections.
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Old 06-04-2019, 05:54 PM
 
Location: Anchorage
1,031 posts, read 677,117 times
Reputation: 2706
You may have damaged the alternator when you did that. A bad diode in the alternator will drain the battery even when the car is not running. That might explain why it ran ok the rest of that day but was dead 4 days later.
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Old 06-05-2019, 09:09 AM
 
13,341 posts, read 15,227,297 times
Reputation: 17910
Quote:
Originally Posted by Northrick View Post
You may have damaged the alternator when you did that. A bad diode in the alternator will drain the battery even when the car is not running. That might explain why it ran ok the rest of that day but was dead 4 days later.

In that case, pull the battery and the alternator and have them tested.
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