Fairly substantial draw on cranking batteries when shut off and stored

January 22, 2024, 03:43:21 pm

Hello Everyone, I recently had to replace the two group 31 cranking batteries in our 2007 Nimbus 336. When connecting the two new batteries i noticed an unmeasured but i believe significant draw. Knowing that some computers and ABS systems can stay active does anyone know what is an acceptable draw when the coach is shutdown and in storage/ Thanks in advance from not so sunny Florida

Re: Fairly substantial draw on cranking batteries when shut off and stored

Reply #1 – January 22, 2024, 09:34:04 pm

You may try to fit an amp meter across the post to one lead cable .
Pull fuses and watch the meter or test light.
There are many things that can draw power. In my case i had an amp that failed to shut off with the radio.
The alternator , may also have a failed diode pack , etc.

Re: Fairly substantial draw on cranking batteries when shut off and stored

Reply #2 – January 23, 2024, 08:32:33 am

Quote from: Niels – January 22, 2024, 03:43:21 pm

>>Hello Everyone, I recently had to replace the two group 31 cranking batteries in our 2007 Nimbus 336. When connecting the two new batteries i noticed an unmeasured but i believe significant draw.

Did you observe a "spark" when connecting the final cable? That could be from the capacitors int he electronics charging. If you have a real concern, the $8.00 VOM from Harbor Freight will tell you everything you need to know, just lift a cable and connect the VOM set for Amperage in series so the entire electrical load of the quiescent coach travels through the meter.

>>Knowing that some computers and ABS systems can stay active does anyone know what is an acceptable draw when the coach is shutdown and in storage/ Thanks in advance from not so sunny Florida

Acceptable draw? None. If you can't supply shore power lift one of the battery cables while in storage.

Art

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