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Old 10-05-2010, 07:03 AM   #1
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12 volt power problem

May be someone can help!!! I have a 2005 Monaco Imperial and I have a over charging problem with the chassis batteries. The volt gage shows 13 to 14 volts and the Aladdin system show battery status at between 15.9 to 17.0 volts. I killed 2 new bateries driving back to Kansas over the weekend. I replaced all my batteries both the chassis and the deep cell house batteries with new. Started the coach, it work fine. Today the chassis batteries are died. The coach will not start and if I use the boost switch for the deep cells, it starts, but as I release the switch the engine dies. I removed the Alternator, took it to a local shop for testing and it passed all the tests. Any Suggestions?????
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Old 10-05-2010, 07:31 AM   #2
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If you are checking the chassis batteries, when only the engine is running and it is charging above 13.8 volts, the ground connections should be checked, or the alternator voltage regulator is defective. If the generator is running or you are plugged into shore power, check the 12 volt converter is either defective, or if it is a inverter converter unit with a external control panel, it will need to be reprogrammed. Normal charging voltage should not exceed 13.8 volts. Also perform tests with a known good volt meter. Your panel may be giving a false reading. As far as the batteries appearing dead, check the voltage first. If there is low voltage a battery drain may be present. It may be caused by the alternator voltage regulator, causing a drain. It does not appear that you have not performed any repairs, and alternator voltage regulator do not repair themselves. If the batteries are charged and it will not turn over, check all connections first. If that checks out, a auxillary start selenoid or the main starter selenoid may be defective.
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Old 10-05-2010, 11:18 AM   #3
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Thanks for the help!!!!
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Old 10-06-2010, 11:51 AM   #4
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Quote:
Originally Posted by Bruce Hultma View Post
May be someone can help!!! I have a 2005 Monaco Imperial and I have a over charging problem with the chassis batteries. The volt gage shows 13 to 14 volts and the Aladdin system show battery status at between 15.9 to 17.0 volts. I killed 2 new bateries driving back to Kansas over the weekend. I replaced all my batteries both the chassis and the deep cell house batteries with new. Started the coach, it work fine. Today the chassis batteries are died. The coach will not start and if I use the boost switch for the deep cells, it starts, but as I release the switch the engine dies. I removed the Alternator, took it to a local shop for testing and it passed all the tests. Any Suggestions?????
I fought the same problem with my 2002 Suncruiser. After replacing the house batts 3 times in 6 years and having numerous "experts" tell me that alternator voltage of 15.3+ volts was OK, I took the beast to a auto electric shop. He took a couple measurements and looked up the alternator in the parts list. It appears there are 2 different alternators for the workhorse.

He discovered that the alternator had a regulator set to 15+ volts and this particular alternator was made for units having a solid state isolator instead of a solenoid switch.

The regulator is replaceable and he ordered the correct one. It was fixed that day and the charging voltage now runs at a safe 13.6 volts. I have been running this one for 2+ years and have had to add water only twice.

Have a "good" auto electric shop check that out.
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