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Old 05-20-2018, 10:06 AM   #1
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Need Help with Battery Boost Switch

So decided to swap out the "ABS" switch on the dash that can use the house batteries to start the engine if ever your chassis batteries are dead for an actual "Battery Boost" switch. They are both momentary switches.

Need some help figuring out what the ABS switch does. I used my tester and ran current through all the connectors both at rest and pressed. None completed or broke a circuit.

I labeled some pictures to see if anyone could help figure this out. Let me know if I have everything labeled correctly.
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Old 05-20-2018, 11:21 AM   #2
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shultz01

Great info but more testing is needed.
1. Do you have a remote relay that actually closes when switch is pushed in the boost mode?
Usually it looks like an old starter relay and should be two of them.
Here is a generic picture of mine in my motorhome.

Hope this help you a bit.
Good Luck.
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Old 05-20-2018, 11:38 AM   #3
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Thanks Iggy. I think I figured it out. I decided to test the "ABS" switch while plugged in versus unplugged.

White is ground and not effected by the switch. Green and yellow are closed when the switch is not pressed and open when pressed. Make sense?
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Old 05-20-2018, 11:52 AM   #4
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interesting....but 'why' does your unit have such an 'ABS' switch in the first place?
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Old 05-20-2018, 12:10 PM   #5
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It's not actually for the brakes (even though that's what the symbol on it would have you think). It is used for battery boost because it is a momentary switch that does what it needs to do...open the circuit when pressed to have the coach batteries start the engine.
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Old 05-20-2018, 12:16 PM   #6
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Originally Posted by shultz01 View Post
Thanks Iggy. I think I figured it out. I decided to test the "ABS" switch while plugged in versus unplugged.

White is ground and not effected by the switch. Green and yellow are closed when the switch is not pressed and open when pressed. Make sense?
Just looks like the Batt Boost switch doesn't have a dedicated ground. The other prong looks like it is used for the opposite action...open when not pressed and closed when pressed.

So not sure what to do with the white ground wire.
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Old 05-20-2018, 12:35 PM   #7
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Originally Posted by shultz01 View Post
It's not actually for the brakes (even though that's what the symbol on it would have you think). It is used for battery boost because it is a momentary switch that does what it needs to do...open the circuit when pressed to have the coach batteries start the engine.
Hummm I don't have that ABS, I have this
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Old 05-20-2018, 12:59 PM   #8
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Hummm I don't have that ABS, I have this
Yep. They recently started using a switch that does the same thing but is labeled correctly.
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Old 05-20-2018, 02:55 PM   #9
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The old one was labeled correctly too. Auxiliary Battery Start .
I have no idea on the wiring. I’ll have to ask Monday
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Old 05-21-2018, 08:26 AM   #10
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Thanks Brian. I also have this switch as well. Please let me know about the wiring. Thanks. Click image for larger version

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