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Old 06-19-2018, 10:13 AM   #1
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Breakaway switch.

How does the breakaway switch get power from the house batteries?
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Old 06-19-2018, 11:00 AM   #2
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Mine is wired to the DC+ "battery feed" near the umbilical connection (fat black or blue wire) which passes through the fuse box to the house battery.
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Old 06-19-2018, 12:21 PM   #3
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On my 2017 FC20 there is a positive bus bar between the battery and the battery switch solenoid. Coming off this buss is a fused black wire that feeds the breakaway switch. In this configuration, the breakaway switch is not turned off by the standard battery switch, so if the battery is good the breakaway will always be ready.
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Old 06-19-2018, 01:28 PM   #4
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Quote:
Originally Posted by Malia20 View Post
On my 2017 FC20 there is a positive bus bar between the battery and the battery switch solenoid. Coming off this buss is a fused black wire that feeds the breakaway switch. In this configuration, the breakaway switch is not turned off by the standard battery switch, so if the battery is good the breakaway will always be ready.
I see. Thanks.
I knew there wasn't a pair in the battery box, and I've installed a battery disconnect switch on the black or - side. I'll need to keep the battery switch "on" while towing or else the brakes have no emergency power.
I'd do that anyway because with the batteries "off" the tow vehicle won't charge the batteries either.
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Old 06-19-2018, 02:31 PM   #5
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Hi

The weird thing that *looks* like a DC bus bar actually isn't one. Yes, that *is* a surprise. Instead it's a weird SAE Type II breaker arrangement. It very much does look like a bus bar though doesn't it? The breakaway runs through a breaker to get to the battery. Since it's a thermal / self reset breaker it is very non-obvious that's what they did.

Bob
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