2003 Sunseeker House Batteries dies

The battery is probably dead. Have you pulled the battery, fully charged it and had a load test done on it?

That Red Key most likely must be ON in order to Charge the House Battery. Converter/Charger "Might" be wired differently but I doubt it. Must be OFF when coach is unplugged. There are various devices that draw power while off, or can't be turned off (like LPG alarm) that those Parasitic Loads will run a good battery down in a week or less.

Batteries have been charged and tested. Generator will run for a little over an hour before it dies, even if we’re driving. I figured the generator or alternator should be charging the house batteries. There’s an open in the charging circuit somewhere. We’re gonna turn red key to connect batteries and leave it on constantly. Will update if that’s it.

If you can pull the red key out its turned off and will not charge the batteries.

txnese wrote:
We’re gonna turn red key to connect batteries and leave it on constantly. Will update if that’s it.

That is a battery disconnect switch and with many models it disconnects the batteries from EVERYTHING, including the charging equipment.

It should be put into the "disconnected" position only when not in use for a week or more and not connected to external power.

Consider your power sources - if the generator is running, do you have 115v at your receptacles? If not then the circuit is open. Check your transfer switch. That transfer switch may be a actual ATS module, or it may be a "manual" switch. If it's manual, the shore power plug needs to be plugged into the 30A receptacle in the compartment where the shore power cord is stored.
Our '16 2250 had the receptacle. I replaced it with an Progressive Dynamics ATS so I didn't have to play that game.

Another thing to check - if the engine is running and the generator is not (or not connected, as above), then you should have similar voltage at the house batteries as you do your chassis battery. If you do not, chances are you've run into the same issue I had - the wiring to the BIC (Battery Isolation Circuit) (see my post: House batteries not charging from chassis (SOLVED)) is not properly connected to an active (when key is on or engine is running) chassis power lead.

The red key must be on in order to have electricity going into the batteries or out of the batteries. If the key is on and voltage tester shows less than 13 volts going into the house batteries with the engine running, then the first thing is to check that the battery terminals are clean. Use a wire brush to clean both the terminals and the cable connections. Then check with voltage tester again while the engine is running. If still not charging then check what BruceMc said above.

Be aware that not all motorhomes, especially the older ones, charge the house batteries when the engine is running. If your motorhome is equipped with a Bi-Directional Isolator Relay Delay (B.I.R.D.) device or a Trik L Start, it will charge the engine and house batteries from the alternator, generator, or shore power. Make sure the red switch is in the on position, otherwise, you will not be able to crank the generator, nor charge the house batteries from the alternator or shore power. I would suggest that you first locate the converter/charger, to make sure it is getting power and that power is being directed to the fuse panel. With a multi meter, measure voltage at the house batteries with the generator running, then engine, and then shore power. If the converter/charger is working properly, you should see a change of voltage, indicating a charge. Good luck.

So we charged up the battery overnight and took a 3 hour drive with the Red key on/connected. Generator stayed on the whole time, where it died twice within an hour last couple of times. Just wanted to thank everyone for the information.

Thanks for following up