Battery Isolator or solenoid

[tlbrown1]

I "think" my chassis battery problem might be relevant to this string.


My 02 Diplomat in storage for two months, with shore power connected. Coach Batteries were maintained fully charged. But Chassis Batteries were down below 9 volts. Engine would not start. Engaging the AUX START switch had no effect.


Is there a single-point-failure of a relay or solenoid causing my problem.... problem of chassis battery charge not being maintained while on shore power and the failure of the AUX START switch to function?

[Old Scout]

Not familiar with your rig [Alpine Forum] but most coaches have one of several ways to keep the coach chassis batteries charged: 1--solar cells on roof; 2--a stand-alone battery isolator for when the diesel is running; 3--an echo charger that "trickle" charges the chassis bats from the house bats when the house bats are being charged from the inverter [ie, via shore power while in storage or while parked; 4-- something called a "BIRD" system [not related to Alpines]; or 5--newer Alpines have a solenoid between bats, controlled by comm system [Vansco], that opens/closes based on a pre-determined logic in the Vansco. The Boost button on many coaches manually override the Vansco or other logic and ties the chassis and house bats together. If your rig is so configured, a bad solenoid would explain why your chassis bats dont charge while in storage nor why your boost button doesnt tie the bats together.

[Janet and Todd]

I just bought and installed a new Big Boy from Murcal and still have the issue. Yes I bought the correct one.

[DrDaveMA]

Originally Posted by tlbrown1

I "think" my chassis battery problem might be relevant to this string.


My 02 Diplomat in storage for two months, with shore power connected. Coach Batteries were maintained fully charged. But Chassis Batteries were down below 9 volts. Engine would not start. Engaging the AUX START switch had no effect.


Is there a single-point-failure of a relay or solenoid causing my problem.... problem of chassis battery charge not being maintained while on shore power and the failure of the AUX START switch to function?

TlBrown1,

This is the Alpine forum, not that I want you to leave, but you will get more accurate answers on the Monaco forum.



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Dave, Bobbi and Fenway

[casper124]

I would also be suspicious of the Xantrex and it causing issues. I experienced battery charging problems until I discovered my Xantrex went south. Also wired in a echo charger and have solved issue of charging starting batteries and clicking solenoid.