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Old 01-19-2019, 06:31 AM   #1
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Battery Boost switch Question

I just picked up a new to me 2010 American Coach Eagle. House batteries apparently need to be replaced. After boondocks game last night house batteries are at 10.5 volts. Coach is running and I need help to know which way to toggle the aux start switch. Top of switch says “coach” and bottom says “gen”. If I’m trying to use coach to start the generator which end do I press?
Have tried both and gen won’t start? Suggestions?
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Old 01-19-2019, 07:20 AM   #2
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If your solenoid is bad just use jumper cables to the house main terminals to start the generator

Some use a Bush fix jumping the solenoid
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Old 01-20-2019, 07:13 AM   #3
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Quote:
Originally Posted by lwmcguire View Post
If your solenoid is bad just use jumper cables to the house main terminals to start the generator

Some use a Bush fix jumping the solenoid


I was able to get the generator started by plugging into 20 amp plug and letting it charge for about 30 mins. I’m gonna have house batteries checked because they should’ve been able to support the coach for 6 hours without getting so drained that chassis batteries weren’t able to jump them. Nothing was running overnight except the fridge. Thanks for your response.
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Old 01-20-2019, 07:21 AM   #4
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With couch running, the house batteries should show some charging. That's automatic.

The solenoid that does that is the same one that the boost switch controls. The solenoid is a very common failure item.

Find it and see if it passes voltage from one side to the other if the large terminals.
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Old 01-20-2019, 10:43 AM   #5
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The battery boost switch should be a momentary one, i.e. spring loaded and returns to the open position when you release it. If the switch you are looking at has two positions and stays in either one, it maybe has some other function? Not sure what, though. My '04 didn't have one labeled like that (and I'm guessing your '06 didn't either).
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Old 01-21-2019, 01:24 PM   #6
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The battery boost switch should be a momentary one, i.e. spring loaded and returns to the open position when you release it. If the switch you are looking at has two positions and stays in either one, it maybe has some other function? Not sure what, though. My '04 didn't have one labeled like that (and I'm guessing your '06 didn't either).


Indeed this is a spring loaded switch with a house position and a chassis. On my Tradition there was just one option and it didn’t matter if you were trying to start the coach or the generator. It basically connected all of the batteries and you could start whichever motor wasn’t running. With This switch I just need to see it the toggle means you are using the source as the jumper or the jumpee (if there is such a word)
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Old 02-13-2019, 03:47 PM   #7
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Your Boost switch puts power to a solenoid that jumps house and Chassis batteries together. Solenoid is powered by house batteries. If they are dead solenoid will not fire. Could yours have a second solenoid that could send chassis power to house bank? That would be nice.
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Old 02-13-2019, 04:23 PM   #8
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Re reading your post, is it possable that you have an independent generator battery ?

That would explain the 2 selections on the switch.
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