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Old 12-28-2017, 01:08 PM   #1
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What is this red switch?

Does anyone know what this red switch is for? It's on a Thomas built GMC savanna. I was looking for a battery cut off switch because my battery keeps dying, but I found this instead! Thanks!
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Old 12-28-2017, 01:12 PM   #2
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It is a circuit breaker.

I suspect that you will need to add a battery disconnect.
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Old 12-28-2017, 01:13 PM   #3
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It's the Main Breaker reset switch.
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Old 12-28-2017, 04:42 PM   #4
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Push the red button and a lever should pop open. That will disconnect whatever those wires go to. If it is the circuit you are questioning you can use that as your disconnect. Push the lever back in to turn on the circuit.
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Old 12-28-2017, 05:15 PM   #5
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If it is popped out. then in my mind?(don't ever get there) it means you have a hot wire grounding out somewhere? It is there to protect the batteries. You can probably push it in and start your bus if it did its job. I would be looking for a wore out 12v hot wire somewhere but the switch itself could be bad?
I have seen both before.
Both GMC flat bed trucks with diesels.
The rear tail light wiring is left floating and that switch will do its job and might give up when it does it and it might not be stuck and can be reset.
If it takes more than a finger to reset that switch then it is bad.
But you can hammer it in and with a good battery charge you can crank up and go wherever.
That's my experience and opinion with what you are asking about?
Good luck
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Old 12-28-2017, 10:32 PM   #6
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Thank you everyone! ✌️������ I've been having issues with the main battery and just got a new one. I was able to start the bus with the button popped out and also with it in but since then it has been very cold and today I tried to start her up but no luck... sounded like it wanted to start but I stopped on my third try... any ideas? Is the button for the auxiliary battery? Best wishes.
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Old 12-30-2017, 04:24 PM   #7
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Quote:
Originally Posted by emilyphotograph View Post
Thank you everyone! ✌️������ I've been having issues with the main battery and just got a new one. I was able to start the bus with the button popped out and also with it in but since then it has been very cold and today I tried to start her up but no luck... sounded like it wanted to start but I stopped on my third try... any ideas? Is the button for the auxiliary battery? Best wishes.
Diesel engines are harder to start in general, very hard to start in cold weather. They have dual batteries to help. They have pre-heaters or glow plugs to help. Sometimes the use ether injection to help.

They have engine block warmers that plug-into 110v extension cord to make it easier to start. This is your best bet. It may already be installed. Look by front bumper for 3- prong house plug.

Charge your batteries before you try again.
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Old 12-30-2017, 04:46 PM   #8
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Does your auxiliaries work regardless of the switch position?
I think that switch needs to be replaced regardless?
Just an opinion?
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Old 02-04-2018, 11:19 PM   #9
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It might be the breaker for the coach battery if it gets too run down it might draw so much charging juice that it trips to protect the truck charging system.

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