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Unread 07-22-2014, 08:30 PM   #1
afearlesshunter
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Location: Greenfield, Indiana
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2003 WJ Voltage around 29 volts at battery..

I installed a new subwoofer amplifier in my new to me 2003 Wj with the 4.7l v8 and I noticed the amp was getting hot quickly. Tonight I checked my voltage (With the jeep running) and it read 29.2 volts.. What would cause this? is this normal?

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Unread 07-22-2014, 08:32 PM   #2
bessyboy
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That's impossible, your whole car would fry in a second!
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Unread 07-22-2014, 08:34 PM   #3
afearlesshunter
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I am very puzzled. I have a voltage meter installed in the inside 12v outlet that consistently reads 13.5-13.6v but on the battery terminals i get 29 something ..
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Unread 07-22-2014, 08:38 PM   #4
bessyboy
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What does the gauge on the dash read?
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Unread 07-22-2014, 08:38 PM   #5
afearlesshunter
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Nvm im retarded . sorry guys.
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Unread 07-23-2014, 02:54 AM   #6
5-90
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Quote:
Originally Posted by afearlesshunter View Post
I installed a new subwoofer amplifier in my new to me 2003 Wj with the 4.7l v8 and I noticed the amp was getting hot quickly. Tonight I checked my voltage (With the jeep running) and it read 29.2 volts.. What would cause this? is this normal?
You have a major problem.

However, is it a major problem with your charging system (29.2VDC is FAR too high for a 12V system!) or with the meter you used to check it?

Verify it with a second DMM.

Nominal voltage for automotive systems is 12.0VDC. Typical battery voltage is 12.4-13.0VDC, typical running system voltage is slightly higher (12.8-14.0VDC.) More than 14.0VDC is a problem, and engine running system voltage should always be higher than resting battery voltage, typically by at least 0.25V.

You can find a writeup I've posted on testing primary electrical components here, but make sure your DMM is properly calibrated and reading correctly first...
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Unread 07-23-2014, 03:23 AM   #7
MadderThanMax
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Wow! 29v that's Impressive... I guess you won't be posting on the HID light thread as yours will be jumping out they're sockets... Nice!
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Unread 07-23-2014, 06:08 AM   #8
BIGBADWOLF
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If was 29 vdc at battery you would have to wear a gas mask. The hydrogen sulfide would either asphyxiate you or cause an explosion!
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