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Old 01-03-2019, 03:16 PM   #1
Senior Member
Jedsmom's Avatar
Brand: Thor Motor Coach
Model: A.C.E. 30.1
State: California
Posts: 133
THOR #3016
Checking Batteries

Some of you might recall a couple of weeks ago I posted about a weird experience we had with our lights & TV. It was determined that it's probably the batteries, as they're original to the rig and are now just over 4 years old.

It was suggested to me by a neighbor that I get a 12-volt battery monitor -- the kind that plugs into the cigarette lighter. So I did. It wasn't expensive, and looks like it's going to be helpful ... once I figure out where to plug it in to monitor the house batteries.

I have 2 cigarette lighter outlets on the dash. I plugged the monitor into both of them and they gave the same reading, so I'm assuming that they're drawing from the same battery/batteries. I just don't know which one(s)! How can I tell, and is there another cigarette lighter outlet in the coach that I don't know about?


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Old 01-03-2019, 03:33 PM   #2
I Think We're Lost!
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Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 14,730
THOR #8860
Can you simply buy an accessory 12-volt plug, and wire it directly to the batteries? You could at least plug that monitor in, and check them out...

Good Sam Member 843599689
FMCA Member F473304
Current coach: Tiffin Wayfarer 24 BW
"Well I may be confused... But you know I sure ain't down!"
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Old 01-03-2019, 04:09 PM   #3
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Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 1,868
THOR #6411
The 12 volt receptacles in the front cap of the plant 750 coaches are powered through the Ford fuse center and the chassis battery beside the engine. Unless you have an inverter with a remote monitor, you cannot check the house batteries without separate battery monitor. You can use a cheap HF VOM to check the house batteries or you can buy a volt meter (e bay and Amazon have hundreds ) and wire it into the coach thermostat's hot wire (black) to check the chassis batteries.
Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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Old 01-03-2019, 06:04 PM   #4
Brand: Thor Motor Coach
Model: Freedom Elite
State: Florida
Posts: 39
THOR #14082
My 2018 Thor has another cigarette lighter plug in the glove box.
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