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Open Roads Forum  >  Tech Issues

 > Battery disconnect - switch or fuse?

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penguin149

Bowling Green, KY USA

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Posted: 06/12/22 04:58pm Link  |  Quote  |  Print  |  Notify Moderator

Looking to add a way to disconnect the battery on my 2019 Keystone Bullet 243BHS. There's a 6 gauge wire coming off the battery to a circuit breaker mounted on the frame, which leads to a second circuit breaker and then under the trailer enclosed by the coroplast. There is a second wire (12 gauge) from the positive side of the battery that has an inline 10A fuse and goes directly under the trailer. I pulled this fuse and can't find what it controls. Any ideas? The prewired rearview camera? The tongue jack is wired to the 2nd circuit breaker and has an inline 30A fuse.

What's the best way to disconnect everything from the battery? Switch (any recommendations?) or inline fuse (40A with 6 gauge wire)?


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bob213

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Posted: 06/12/22 05:03pm Link  |  Quote  |  Print  |  Notify Moderator

This is what I use and I have it on the negative cable without problems. Many will tell you this is wrong and it might be but it has worked on two trailers for 14 years.
Battery switch


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Posted: 06/12/22 05:10pm Link  |  Quote  |  Print  |  Notify Moderator

I use a 12 volt circuit breaker, works great.

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MitchF150

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Posted: 06/12/22 06:18pm Link  |  Quote  |  Print  |  Notify Moderator

Mine came with one. It's under the propane tanks. You have to reach under and then turn the red 'key'. I'm not sure how it's wired, but it's probably on the NEG cable I would think since it's an RV?

Mitch


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Bobbo

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Posted: 06/12/22 06:29pm Link  |  Quote  |  Print  |  Notify Moderator

bob213 wrote:

This is what I use and I have it on the negative cable without problems. Many will tell you this is wrong and it might be but it has worked on two trailers for 14 years.
Battery switch

It's only wrong if it also disconnects the breakaway brakes.


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KD4UPL

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Posted: 06/12/22 06:34pm Link  |  Quote  |  Print  |  Notify Moderator

The 10 amp fuse you pulled is likely for the break away brakes. Put it back.
A negative disconnect will probably also disable the break away brakes so you can't pull the trailer on a road with it turned off.
I'd just use a circuit breaker in the positive main wire.

corvettekent

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Posted: 06/12/22 07:02pm Link  |  Quote  |  Print  |  Notify Moderator

I use a battery switch like bob213 linked to but mine is on the positive cable. I never shut this switch off unless I'm working on the 12-volt battery system.


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wa8yxm

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Posted: 06/13/22 04:32am Link  |  Quote  |  Print  |  Notify Moderator

I would go with a switch and the Negative cable is a good spot or it.
I've seen a lot of argument on negative or positive. but I favor Negative.

On many RV's there are multiple POSITIVE wires is one reason

Another is if you are removing the battery and start with the POSITIVE lead.. if the swich is off and the wrench slips. No harm done

But if the switch is in the positive you can end up with a nasty burn and a melted wrench and worse.


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valhalla360

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Posted: 06/13/22 07:06am Link  |  Quote  |  Print  |  Notify Moderator

If you look up battery switches, the instructions call for the switch to be installed on the positive side.

Not hard to tie multiple Positive side wires together, so that's not really a reason.

If the wrench slips and connects both battery terminals, you still get excitement regardless of which side is switched.

On the other hand, if you are leaning against something metal and touch the negative battery terminal (with a negative side switch turned off), you just completed the circuit (frame and metal parts are typically tied into the grounding system. Probably won't die with 12v but not fun.

Generally, the brakes get a dedicated unfused line but for winter storage, I still prefer to disconnect (always do a brake test when pulling out, so if you forgot to reconnect, it will immediately be obvious).


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Bobbo

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Posted: 06/13/22 03:01pm Link  |  Quote  |  Print  |  Notify Moderator

KD4UPL wrote:

The 10 amp fuse you pulled is likely for the break away brakes. Put it back.
A negative disconnect will probably also disable the break away brakes so you can't pull the trailer on a road with it turned off.
I'd just use a circuit breaker in the positive main wire.

Breakaway brakes are not supposed to be fused.

wa8yxm wrote:

I would go with a switch and the Negative cable is a good spot or it.
I've seen a lot of argument on negative or positive. but I favor Negative.

On many RV's there are multiple POSITIVE wires is one reason

Another is if you are removing the battery and start with the POSITIVE lead.. if the swich is off and the wrench slips. No harm done

But if the switch is in the positive you can end up with a nasty burn and a melted wrench and worse.

Multiple positive wires can be combined.

Always remove the negative cable from the battery first. That way, if the wrench slips when removing the negative cable, no problem. If the wrench slips when removing the positive cable, no problem. In other words, the wrench slipping is never a problem.

If the switch is on the positive, you can’t get a nasty burn and a melted wrench and worse because you took the negative clamp off first.

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