Question about Briggs & Stratton 15,000 Watt Home Standby Generator

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No charging voltage to battery

Model 01815 12Kw Briggs & Stratton Generator. Battery not being "trickle" charged from CMA pcb. PCB pn 191652GS.
If the battery is charged from a external charger the generator will do a manual start and auto start/test, but due to loss of standby charge the battery will run down in several weeks. The sense transformer has the correct voltage to the CMA pcb but output on terminal 12 listed on the unit schematic as power +12vdc at all times. The CMA board also has two test plugs listed as JTAG and RS232 but no info in the service manual as to the devise needed to test from these plugs. Is there a way to confirm pcb failure before purchasing a new pcb?

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Funny, My father who lives 300 miles from me, has a 7kw unit that, hasn't worked right since it was installed 5 years ago.Has had the sevice techs there so much,now they won't even come out anymore.I work in power generation for a power co. After trouble shooting over the phone with the old man,looks like the same problem.Low bat volts.

Posted on Aug 01, 2009

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You can test the charger right at the battery. With the system just sitting in regular stand-by mode. If you lift the battery leads, they should have about 13.5 volts coming in from the trickle charger. If there is no voltage there, it can't charge. It would be a bad trickle charger.

Posted on Jul 04, 2009

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