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Old 10-28-2014, 09:59 AM   #1
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NO 12v Unless on Shore or Generator

I have a friend that has a 1999 Southwind, class A with Ford V10. recently the 12V lights will not turn on unless on generator or shore power. Batteries are OK. When on Shore, there is no 12V feed to recharge the coach batteries. When the engine is running there is charging feed to the coach batteries but still no 12V to lights unless generator or shore power is available.
Inteli Power Model PD9155 has two 20 amp fuses both are OK.
Any help is greatly appreciated.

Mike and Dar
06 Endeavor 40 PDQ
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Old 10-28-2014, 10:38 AM   #2
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Probably a dumb question but is the switch for the house batteries off ?

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Old 10-28-2014, 10:49 AM   #3
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No dumb questions,
The switch makes a click or clunk noise (alternates sounds) in the battery control box in the engine access area. The solenoid has good vlotage from boththe coach and the engine batteries.
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Old 10-28-2014, 11:03 AM   #4
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Check the battery terminals and batteries again just to be sure. Remove and clean the connections even if they look ok.
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Old 10-28-2014, 11:15 AM   #5
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Sounds like batteries to me. How do you know they are good? Did you do a hydrometer check on each cell? Or put on a load tester? A volt meter won't really tell you they are good. It could still read 12v with the batteries being weak or shorted cells.
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Old 10-28-2014, 12:20 PM   #6
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On shore power, the converter is supplying the 12 volts to the appliances. When the engine is running, the alternator supplies the 12 volts, once the power is removed, the Battery Control Center (BCC) is supposed to route the 12 volt power from the batteries to the appliances.

Look for a DC circuit breaker in the Battery Control Center that needs to be reset. It is where you heard the click or clunk sound.

Mine has a DC circuit breaker mounted on a circuit board with a small black push button on the side labeled CB5. Once reset, all my 12 volts from the battery came back on.
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Old 10-28-2014, 02:32 PM   #7
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On shore you get power from a box of electroincs called a converter,

Off shore you lights, water pump, furnace and other 12 volt stuff draws off the HOUSE batteries.

Suspect list in linier order

Are the batteries present?
Are they charged?
When did you last clean the connections?
Is there a fuse or circuit breaker that needs replacement/resetting
Is the DISCONNECT switch in the STORE/OFF/Disconnected position
(Note last two can be reversed, are on my rig)
Master fuse on power distribution center.

And again wires at any point.
Bad wire (Any wire)
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Old 10-28-2014, 07:58 PM   #8
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thanks again for all the help.
Batteries when checked with hydrometer showed FAIR.
Replaced batteries and found two 12V circuit breakers in the Battery Control box.
Re-set both and just like that.... power!.
I was not familiar with 12V reset-able circiut breakers. Looked right at them several times and did not recognize the reset buttons.
Thanks all!

Mike and Dar
06 Endeavor 40 PDQ
lots of sand toys
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