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Unread 04-23-2013, 04:38 PM   #1
a70eliminator
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Pressure switch under my battery?

I continue to reveal new oddities on my 5.9 like what is the purpose of the pressure switch under my battery, it appears to spring load open when battery is removed?

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Unread 04-23-2013, 05:08 PM   #2
durango-bob
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It's a temp sensor. I guess it's to prevent the battery from heating up too much when charging.
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Unread 04-23-2013, 06:46 PM   #3
coralman
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Kinda. The switch sends a signal to the pcm which contains the voltage regulator. This signal is dependant on battery temp. Don't really know how accurate the system is cause mine sits at 14v, hot,cold,or otherwise.
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Unread 04-24-2013, 06:42 AM   #4
Uniblurb
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Your voltage should be dropping down from 14V coralman after the battery warms up. Higher voltage when cold and drops gradually as it warms up. Next time you have your battery out disconnect the wiring harness to the sensor and you should be reading between 9K-11K ohms at the sensor 2-wire connection. Supposed to replace the sensor if not reading within this range. Just thought I'd pass this along.
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Unread 04-24-2013, 11:44 AM   #5
coralman
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Will do Uni, thanks!
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Unread 04-24-2013, 10:21 PM   #6
Uniblurb
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No problem coralman and good luck!
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-Stalling ZJ? 12 things to check before replacing a sensor; the Dirty Dozen
-Crankshaft position sensor multimeter test. & video of testing.
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Unread 08-04-2013, 12:24 PM   #7
Rockbasses
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Quote:
Originally Posted by a70eliminator View Post
I continue to reveal new oddities on my 5.9 like what is the purpose of the pressure switch under my battery, it appears to spring load open when battery is removed?
Just found mine today too! Thanks for the info from this thread. I was just wondering?!
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