Battery Boost relay sticking on

[Joe & Bonnie]

Wonder if anyone else has seen this.
When I plug in on shore power, the battery boost relay in the battery compartment latches on and stays "on" until I unplug from shore power. When I'm not plugged in, the relay operates normally - you can hear the clunking sound when I press the batt boost switch.
The wiring schematic from Monaco shows this to be a simple circuit getting a switched +12VDC from the front panel through the batt boost switch, right back to the relay. No electronics or solid state stuff to act up.
When the relay was latched, I disconnected the ground momentarily to drop the relay and when I reconnected it, the +12VDC on the relay was gone.
On paper, this is too simple a circuit to be acting like this and I'm afraid I'm gonna have an overheat situation when plugged in. Any ideas anyone?

[loranimal]

Is your MH set up to charge the chassis batteries when plugged in? They may be why the relay is latching so it can charge those batteries too. I know some Monacos were set up that way. My 07 isn't, but maybe being an 09 it maybe.

Carl

[gg]

My 09 charges the chassis battery when plugged into a 50 amp shore plug. The coach has a inteli-power 9200 series charge wizard that has 4 modes: Boost 14.4v, normal 13.6v, storage 13.2 and desulfation 14.4v burst for 15min in a 21 hour period. Monitoring the voltage at the engine control service plug it reads 13.2 to 14.2 volt per the Scanguage II.

[MARANATHA]

Quote:

Originally Posted by Joe & Bonnie Wonder if anyone else has seen this. When I plug in on shore power, the battery boost relay in the battery compartment latches on and stays "on" until I unplug from shore power. When I'm not plugged in, the relay operates normally - you can hear the clunking sound when I press the batt boost switch. The wiring schematic from Monaco shows this to be a simple circuit getting a switched +12VDC from the front panel through the batt boost switch, right back to the relay. No electronics or solid state stuff to act up. When the relay was latched, I disconnected the ground momentarily to drop the relay and when I reconnected it, the +12VDC on the relay was gone. On paper, this is too simple a circuit to be acting like this and I'm afraid I'm gonna have an overheat situation when plugged in. Any ideas anyone?

Hi,
That solenoid is really a problematic part. I repaired mine twice in two years. Inside contacts are easy to corrode. Sand/clean it down and lube with di-electric compound. Next time, i'm gonna buy a different brand from napa or make it manually. Tnx.