04 Fleetwood Revolution with 4 - 6 volt house batteries. Batteries are Trojans less the a year old.I'm currently plugged into shore power, 50 amp service.Yesterday my lights were dim, so investigated, the positive lead from the battery to a fuse link was so hot you I couldn't touch it. One of the terminal ends was loose. Went into Klamath Falls about 25 miles away and was able to get a new cable with new ends made.Installed the new cable and everything appeared to be ok. Checked the cable again last night and was cool to the touch. When I went to bed last night I noticed the Norcold Frig window going thru various indications, didn't pay much attention to it. Got up this morning and lights were very dim. Looked at Norcold and it's flashing Lo dc. Checked battery cable and it's cool.......batteries are at around 10.5 volts. The cable side from the batteries of the fuse link is 10.5 volts. and the other side is of the fuse is 13.75 volts. All AC in the couch is working fine. My Xantrex indicator shows the following.The 3 little battery indicators shows fullAC in light is onDC volts is 13.5Incoming AC Breaker Amps 30 (I'm hooked up to 50 amps)Should I start the generator and see if the batteries charge up. Any help is greatly appreciated. ThanksBrian

I think you have a bad cell in one battery. I would disconnect them all and check their voltages.

Check the battery charger portion of your inverter/charger. It may be trying to charge your batteries too much. Turn off the charger portion and see if things cool down. If that takes care of the issues than you need to find out why the battery charger is going crazy. Either a battery is bad or the charger is bad or not set up right.

supercub wrote: The cable side from the batteries of the fuse link is 10.5 volts. and the other side is of the fuse is 13.75 volts. All AC in the couch is working fine. BrianIf I understand your statement above ( and it was not crystal clear to me ) your fuse is OPEN. Also, at 10.5 volts your batteries are totally depleted and most likely have been severely damaged. . . probably will need replacing. The reason you have 13.5V on the other side of your fuse is because your battery charger/power supply is providing the DC voltage for your coach.

Blown fuse and charger cannot charge batteries. 12V power is supplied from the batteries, not the charger. Takes some doing to blow that fuse so I would disconnect two of your batteries and bypass the fuse and see how hot things get and if you have a cell in the batteries being charged that is bubbling almost immediately... bad cell.After several hours switch to the other two batteries and repeat. If no cells bubble then hook all four back up and try and find the right fuse.

Nothing is hot this morning, everything is cool to the touch. Ed, why would one side have 13.5 and not go thru the fuse to the other side? is there a diode in the fuse assembly? I'm just wondering if I have put some of the wires back on the wrong terminals when I put the new cable on. I know the new cable is on the correct terminal. Removed the ground cable on one battery, and I just wonder if I got one of the cables on the wrong terminal. I'll have to study the situation

DC Electrical Problem. HELP !! | Good Sam Community

36 Replies

wwest
Explorer
Jun 14, 2015
Obviously HIGH resistance between the battery posts and the charger.

Could be either + or - connection.

Have a good/close look at the fuse and fuse holder.

But don't forget the chassis ground connection.

And NEVER charge that deeply discharged battery bank from the alternator/VR system.
supercub
Explorer
Jun 14, 2015
Nothing is hot this morning, everything is cool to the touch. Ed, why would one side have 13.5 and not go thru the fuse to the other side? is there a diode in the fuse assembly? I'm just wondering if I have put some of the wires back on the wrong terminals when I put the new cable on. I know the new cable is on the correct terminal. Removed the ground cable on one battery, and I just wonder if I got one of the cables on the wrong terminal. I'll have to study the situation
Ivylog
Explorer III
Jun 14, 2015
Blown fuse and charger cannot charge batteries. 12V power is supplied from the batteries, not the charger. Takes some doing to blow that fuse so I would disconnect two of your batteries and bypass the fuse and see how hot things get and if you have a cell in the batteries being charged that is bubbling almost immediately... bad cell.
After several hours switch to the other two batteries and repeat. If no cells bubble then hook all four back up and try and find the right fuse.
Ed_Gee
Explorer II
Jun 14, 2015
supercub wrote:
The cable side from the batteries of the fuse link is 10.5 volts. and the other side is of the fuse is 13.75 volts.
All AC in the couch is working fine.

Brian

If I understand your statement above ( and it was not crystal clear to me ) your fuse is OPEN. Also, at 10.5 volts your batteries are totally depleted and most likely have been severely damaged. . . probably will need replacing. The reason you have 13.5V on the other side of your fuse is because your battery charger/power supply is providing the DC voltage for your coach.
rgatijnet1
Explorer III
Jun 14, 2015
Check the battery charger portion of your inverter/charger. It may be trying to charge your batteries too much. Turn off the charger portion and see if things cool down. If that takes care of the issues than you need to find out why the battery charger is going crazy. Either a battery is bad or the charger is bad or not set up right.
ScottG
Nomad
Jun 14, 2015
I think you have a bad cell in one battery. I would disconnect them all and check their voltages.

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DC Electrical Problem. HELP !!

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