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Old 11-20-2011, 06:30 AM   #1
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confused about m o m

when to switch to m o m. need to know when to switch over. thanks harvrk

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Old 11-20-2011, 07:45 AM   #2
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If you are talking about what I think you are, its used when the batteries are low. You can hold it momentarily to connect the coach and chassis batteries to start the engine. When you release, they are disconnected.

Jerry & Patsy Potter, Taz & Jake Jr.
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Old 11-20-2011, 11:18 AM   #3
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Yeah.... what he said.
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Old 11-20-2011, 11:40 AM   #4
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I've used it a couple of times usually when the chassis battery that came from Wally world dies. When it dies for good and it isn't replaced under warranty any more then I get to buy a real battery!
Cheers from Central Texas
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Old 11-21-2011, 12:18 PM   #5
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Yep!.. I bought a 29 series battery from wally world and it lasted over 7 years! The ones i replaced it with are dead and of no use..other than a big paperweight!!
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1994 5th wheel 30 foot trailer
I'm lost. I've gone to look for me. If I should return before I get back, please ask me to wait.
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Old 11-21-2011, 12:22 PM   #6
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I gotta ask....what does M.O.M. stand for?
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Old 11-21-2011, 12:24 PM   #7
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Mother of the Month, heck, I don't know but I am sure one of these experienced people will tell you. Good Luck.
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Old 11-21-2011, 12:36 PM   #8
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Old 11-21-2011, 12:50 PM   #9
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fletch460 is correct - MOMentary. It's a normally open switch that has to be physically held in the closed (on) position to connect the house and chassis batteries in parallel. When the switch is released it returns to the open position and the batteries are disconnected from one another.
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Old 11-21-2011, 02:10 PM   #10
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DA! OK it's an abbreviation not an acronym. Yep, on my dash I have an "Aux Start" switch that's a mom. I only use it if the start battery is dead. Only had to use it once and I hope to never use it again.
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Old 11-21-2011, 05:21 PM   #11
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MOMentary in case you wonder what it is.. there are several types of switches

PUSH-PUSH Means Push to turn on Push to turn off

Rocker or Toggle, Push or flip one way for on, the other way for off

Spring return means they return to a preset (Either on, off or center)

MOM is another term for Spring return.. Usually a push button, PUSH on, release for off... Momentary contact.. Just like the key contacts on your keyboard.
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Old 11-21-2011, 06:04 PM   #12
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In days of old (like my 78 Chieftain) there is this switch on the dash labeled DUAL/NORM/MOM (Momentary). It is basically a manual BIRD like device that operates the isolation relay. In dual, you charge the Coach and Chassis battery from the engine alternator. In NORM only the Chassis battery is charged by the Alternator. MOM does the same as Battery Boost (AUX Start). It is not designed to allow charging of the Chassis battery by the converter.

This was the precurrsor to modern day BIRD like devices and AUX Start switches. Today Winnebago has the AUX Start switch (Battery Boost) wired such that when the engine is running it always enables the isolation relay (DUAL mode on my rig). The difference between the switch at rest and AUX Start is the source of B+. At rest is from the ignition switch, therby chassis battery) and AUX Start is from the Coach battery.

I now have a modern PD9200 Series converter and AC/DC distribution panel so I plan on also upgrading to a BIRD like system with only AUX start from the dash switch.


Dave in Virginia
1978 Winnebago Chieftain
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