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2004 Jeep Wrangler X: w/ 4.0 6 cyl..light came..voltage..alternator…

Customer Question
I have a 2004 Jeep...
I have a 2004 Jeep Wrangler X w/ 4.0 6 cyl. Recently, my "check gauges" light came on and i noticed the voltage spiked to 16 volts, where it normally is at 14. I tested the system and found the alternator was bad. I replaced the alternator and put in a new battery. 5 days later, the vehicle won`t even turn over. It starts right away with a jump and stays running, voltage normal, but won`t start again. Is it the cellunoid, starter, just a bad battery? thanks for the help
Submitted: 8 years ago.Category: Jeep
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Answered in 3 minutes by:
6/13/2010
Jeep Mechanic: Mark, 22 Year Factory trained technician replied 8 years ago
Mark
Mark, 22 Year Factory trained technician
Category: Jeep
Satisfied Customers: 11,596
Experience: Jeep factory training........25 years in the industry.
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Welcome to Just Answer Jeep my name is Mark.

 

If it will start with a jump start, then your battery is weak/dead. So either the charging system is not keeping the battery charged or the battery is defective.

 

With the engine running put a volt meter on the battery and see what voltage reading you get.

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Customer reply replied 8 years ago
The voltage reads 12 volts while running. This is the 3rd battery of this type (AC Delco)I have put in my jeep, so is it possible its a bad battery type? If the charging system isn't keeping the system charged, what do i do to fix it?
Jeep Mechanic: Mark, 22 Year Factory trained technician replied 8 years ago

With the engine running you need to have at least 13.5 volts so if you are only getting 12 then the charging system is not working correctly.

 

The charging system is controlled and regulated by the PCM aka engine computer, so I would test all your fuses first and also make sure the large battery wire at the alternator also has 12 volts on it.

 

If these thins check out then you might be due for a new PCM but if that is the point you reach I would suggest a shop due a final test with their scan tool prior to you spending the money on the PCM.

 

Mark
Mark, 22 Year Factory trained technician
Category: Jeep
Satisfied Customers: 11,596
Experience: Jeep factory training........25 years in the industry.
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Customer reply replied 8 years ago
thank you, XXXXX XXXXX help.
Jeep Mechanic: Mark, 22 Year Factory trained technician replied 8 years ago
You're welcome.
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