Community Forums

JAM3 · 12-05-2022, 10:10 AM

Can anyone explain how the chassis batteries are grounded as compared to the house batteries?

I do have 12v in the coach if I run the engine.

Arch Hoagland · 12-05-2022, 10:26 AM

Have you measured the house battery voltage with a voltmeter right at the batteries themselves?

jacwjames · 12-05-2022, 10:26 AM

Not sure what the difference is between your 1998 vs my 2002 Windsor but I have a ground stud for the house batteries and chassis batteries.

I have an isolation solenoid that will combine the house & chassis batteries together. The isolation solenoid can be closed to connect both bank by using the auxiliary boost button on the front dash but will also close when the engine is running if you have a BIRD, this will let the engine charge the house batteries as you are driving.

My wiring had the Solenoid, BIRD, and Lambert 415 maintainer. This design kept both my house and chassis batteries charged whether I was driving, running shore power, or generator. Do you have these???

In your previous post you mentioned that you had a problem with the front switch. Did you replace or just disconnect.

What do you have in place for charging your lithium batteries, a DC-DC charger??? Who installed the lithium?? Did you do install. Can you provide pictures of how you did it??

bubby124 · 12-05-2022, 11:16 AM

Try hooking a jumper cable fron the negative side of the battery to the frame if it fixes your issue then you have a bad ground from the battery to the frame

JAM3 · 12-05-2022, 11:55 AM

Where are the ground studs located?

JAM3 · 12-05-2022, 12:10 PM

I'll try to answer some questions.

House battery voltage 13.7
Chassis battery voltage 13.9

I do have an isolation solenoid.
Front switch is disconnected.
Charging is by 800 watt solar, 100amp charger in inverter and a little by the alternator.
I installed the lithium batteries over 2 1/2 years ago. Have had no issues until this.

jacwjames · 12-05-2022, 12:48 PM

I have one ground stud for the house and chassis batteries and I believe the starter also is grounded there also. It is located on the passenger side behind my rear electrical panel. It is welded to the main chassis rail.

On my rig the only common part between the house and chassis in the rear electrical bay is the isolation solenoid. It must be closed for it to be passing power from the chassis to the house side, and if you have a BIRD then it will send a signal when you start your engine.

So if you are getting 12 volt from the house batteries there has to be a problem between your isolation solenoid and the house batteries. Do you have a battery disconnect?? If it failed it could explain why you don't have house power until the engine is running.
I had my chassis battery disconnect fail and lost all chassis power. I bypassed until I could replace.

JAM3 · 12-05-2022, 01:05 PM

Here is a picture of my electrical panel:

Click image for larger version

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twinboat · 12-05-2022, 01:09 PM

One of the 2 smaller solenoids is house power.

The black things on the sides of the big boy are circuit breakers. Should have power on both sides of all I mentioned.

JAM3 · 12-05-2022, 01:10 PM

I connected a jumper cable from the negative terminal on the house battery to the frame and the interior 12v lights, etc work.

I will look for the grounding lug you described.

cry42 · 12-06-2022, 03:36 PM

Looks pretty similar to my 97 Dynasty. The small solenoid above the BIG start boost solenoid, supplies 12VDC into the coach. It is operated by the infamous Salesman Switch inside the doorway. Should hear it click if operation. Can measure both large terminals, should be 12VDC to ground is solenoid is operated.

Timaz · 12-06-2022, 06:45 PM

Quote:

Originally Posted by JAM3

I connected a jumper cable from the negative terminal on the house battery to the frame and the interior 12v lights, etc work.

I will look for the grounding lug you described.

Did you find the ground stud?
Tim

JAM3 · 12-13-2022, 01:39 PM

After cleaning some grounds and relacing the AUX/START switch things seem to be back to normal.

Thanks to everyone for their suggestions and help.

edmunds57 · 12-13-2022, 04:32 PM

I have a 2006 Monaco Dynasty. once it had NO 12 volt power. It took quite a while to find. Don't know if yours has them, but mine has a bank of computer modules in a closet in the bedroom. One of them controls the 12 Volt power. Each one of these modules has a 5 amp fuse. Don't know why the fuse blew but that was the problem. Has never done it since.