91 SHO reading 18 volts at idle!
- Thread starter AREA 91
- Start date
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Ishodu
SHO Member
Yep sounds like the voltage regulator.
CerberuS
300 HP N/A SHO
like marcel said. but its inside the alternator if im not mistaken.
Car running your supposed to get 14,4V ,nothing more.
Car running your supposed to get 14,4V ,nothing more.
brucebender
New Member
It should read 13 or 14 volts with the car running. With the car off the terminals on the battery should read 12 volts. I've done that alternator bit and it is a bit of work.
sdpatt
Sr. SHO Engr.
For healthy and functional battery, alternator and voltage regulator, the voltage should be 12.5 VDC engine off and 13.6-13.8 VDC engine idling. In the world of SHO engine services, the alternator is a 30-minute piece of cake.
brucebender
New Member
potential problem
I burned out a battery with an overworking alternator. I would consider not driving it right now. I believe you'll burn out the battery. Please guys, any thoughts on this?:type:
I burned out a battery with an overworking alternator. I would consider not driving it right now. I believe you'll burn out the battery. Please guys, any thoughts on this?:type:
projectSHO89
SHOless In St L
brucebender said:
If it isn't fried already, any continued running of the car at that voltage will almost assure the battery will quickly be toast!
Steve
brucebender said:
Yep. Totally right. I drove my car home from school on an overcharging alternator ~180 miles and toasted my battery (I didn't realize it at the time, it was warm. I discovered the battery issue in the cold...while my roommate was laughing at me.
As for your overcharging issue, it might NOT be the Voltage Regulator. My car was doing the same thing and I replaced the voltage regulator, only to discover it was the alternator. One of the sauder joints on the alternator leads broke, but stayed together when the alternator spun (contact from rotation), but was arcing. It was sending 18+ volts to my battery, causing the EATC to default to off and the stereo not to work. At least my lights were nice and bright...
I would suggest going to a junkyard and pulling a voltage regulator from a junker. Really quick to do...and it will tell you what you need to look at. There's also a pinpoint test that you can run in the SHO diagnostic manual.
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