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Old 01-14-2014, 09:36 AM   #1
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Abs light & voltmeter

I have a 1998 Gulfstream Sunvoyager on a Spartan Chassis. It has the 8.3, 12 valve Cummins engine and 6 spd allison trans.
My problem is when the ABS light comes on the voltmeter jumps to 16 volts. The original owner stated the he was told by either spartan, cummins, or the mfg of the alt (I can't remember which) to run a seperate wire from the alt to the battery and that should "fix" the problem.
Any suggestions and or help would be appreciated.

tx/Bob
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Old 01-14-2014, 03:53 PM   #2
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Thom ran another ground from the alternator to the frame. Then another from the batteries to the frame. Then one from the tachometer to the frame. I am sure there were a few more in there somewhere. Fixed all problems but one. That fix came from Monaco, this was from them -- "Try putting a 300 ohm or so resister between the send and ground posts on the tach, one of the other techs brought this up at a meeting the other day" Fixed what was left of the jumping tach and other things. The ABS light turned out to be the cruise control needing a new part.
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Old 03-13-2014, 06:39 PM   #3
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Any Other Responses

Quote:
Originally Posted by Jarvis View Post
I have a 1998 Gulfstream Sunvoyager on a Spartan Chassis. It has the 8.3, 12 valve Cummins engine and 6 spd allison trans.
My problem is when the ABS light comes on the voltmeter jumps to 16 volts. The original owner stated the he was told by either spartan, cummins, or the mfg of the alt (I can't remember which) to run a seperate wire from the alt to the battery and that should "fix" the problem.
Any suggestions and or help would be appreciated.

tx/Bob


I cleaned the front sensors, but I'll be darned if I can find any on the rear. Have not driven the RV since cleaning, but still have this voltage spike when ABS light comes on after engine if running.
I have read about all I can find of the subject. Is there a way to disable the system to see if I still get these spikes?
Any suggestions/theories/help would be appreciated.

Tx, Bob
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Old 03-14-2014, 07:54 AM   #4
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On a car I used to have the ABS light coming on usually meant LOW voltage.

Two possible issues: one is a bad ground somewhere (The alternator was not properly grounded on a DIFFERENT car I had) or a bad voltage regulator, this may be part of the very expensive alternator or a seperate component on a less expensive alternator.

I recommend a 2nd voltmeter if possible to verify high voltage.
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