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04-18-2016, 06:03 PM
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#1
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Junior Member
Join Date: Apr 2016
Posts: 9
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Bussmann Hi-Amp Circuit Breaker - Which wire where?
Hi everyone,
I have a 2016 sunseeker which has a 150 amp circuit breaker located under the engine hood on the passenger side. On the breaker there are two connections; one labelled BAT the other AUX.
When I removed the battery in the engine compartment for the winter I didn't make a note of which of the 2 positive cables were connected to BAT and AUX.
There is a small positive cable that originates from the engine battery, and another long positive cable that seems to run towards the back of the motorhome.
My question is: Which wire goes goes to BAT, which goes to AUX?
Thank you in advance.
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04-19-2016, 08:20 PM
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#2
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Junior Member
Join Date: Apr 2016
Posts: 9
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Bussmann Hi-Amp Circuit Breaker - Which wire where?
If someone can post a picture showing the engine battery and circuit breaker with the cable connections that would help as well.
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04-19-2016, 08:20 PM
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#3
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Senior Member
Join Date: Mar 2016
Posts: 139
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Wire from the battery goes to the terminal labeled batt.
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04-19-2016, 08:23 PM
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#4
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Junior Member
Join Date: Apr 2016
Posts: 9
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Bussmann Hi-Amp Circuit Breaker - Which wire where?
Thanks opie. Where does the aux wire connect to out of curiosity?
I read somewhere it connects to the "Battery Control Centre" which leads up to the coach batteries. Is this correct?
So BAT to engine battery and AUX to the "Battery Control Centre"?
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04-19-2016, 09:04 PM
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#5
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Senior Member
Join Date: Mar 2016
Posts: 139
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Through process of elimination, yes.
But I am not familiar with your set-up. If you have 2 free wires and one of them comes from the batt, then elimination says the other free one goes to the open post on the breaker after connecting the batt to the batt post.
Its probably labeled "AUX" because the breaker manufacturer doesn't know what the end user is going to use it for other than to open and close a circuit.
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04-19-2016, 09:48 PM
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#6
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Junior Member
Join Date: Mar 2016
Posts: 19
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Here's a picture of mine if that's any help. The bottom line goes to the battery, the top line travels deep back into the engine compartment.
Steve
__________________
Steve
2016 3010DS Sunseeker
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04-19-2016, 09:56 PM
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#7
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Junior Member
Join Date: Apr 2016
Posts: 9
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Thanks Steve. Appreciate the picture.
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04-20-2016, 12:59 PM
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#8
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Senior Member
Join Date: Apr 2012
Posts: 3,275
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Batt goes to the source or battery; aux is the load. It is important.
WW
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04-20-2016, 01:54 PM
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#9
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Junior Member
Join Date: Apr 2016
Posts: 9
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Bussmann Hi-Amp Circuit Breaker - Which wire where?
Thanks WolfWhistle. Where does the aux cable run to specifically? Is it the battery control centre for the coach batteries?
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04-20-2016, 03:00 PM
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#10
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Senior Member
Join Date: Dec 2012
Posts: 7,645
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Do you have an emergency start feature?
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04-20-2016, 03:24 PM
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#11
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Junior Member
Join Date: Apr 2016
Posts: 9
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Bussmann Hi-Amp Circuit Breaker - Which wire where?
Yes, next to the drivers seat there is a switch to allow the coach batteries to start the engine.
If that is the case, does it matter which battery (engine or coach) connect to BAT on the Bussmann circuit breaker?
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04-20-2016, 05:27 PM
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#12
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Senior Member
Join Date: Dec 2012
Posts: 7,645
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Well, it's a two way street. If you select emergency start to start the coach the coach batteries will supply the voltage to do that. However; if, for example, you have electric steps and they do not extend for low coach battery, hitting the emergence start will supply the power to extend the steps. Emergency start typically just ties the two (coach/chassis) batteries together. I think I am correct here but I don't have your schematic to verify. I have a Georgetown and I know this is how mine functions.
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04-20-2016, 07:42 PM
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#13
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Senior Member
Join Date: Dec 2012
Posts: 7,645
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Oh yeah, forgot to mention that I don't think these type circuit breakers are polarity sensitive. They are used in applications where current limiting is needed and a reset of the device can be made as opposed to a fuse blowing.
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04-20-2016, 08:00 PM
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#14
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Junior Member
Join Date: Apr 2016
Posts: 9
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Thanks bubbles. Makes sense.
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04-21-2016, 08:39 AM
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#15
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Senior Member
Join Date: Apr 2012
Posts: 3,275
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Quote:
Originally Posted by geoman
Thanks WolfWhistle. Where does the aux cable run to specifically? Is it the battery control centre for the coach batteries?
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G, I can't tell you that. It could be a distribution panel or some kind of transfer relay for emergency, or both. To the truck or chassis, all the RV stuff is like an accessory, thus the aux(illary) name on the label. Is there a wiring schematic available? I'm still trying to understand why you removed a cable (or two) from the breaker to remove the battery; rather from the battery itself. But, why wouldn't the battery be connected to the BATT terminal and the cable running to the back to the AUX? But, are there batteries in the back?
WW
__________________
Hyper Lite was sold
2017 F-250 4x4 6.2L Gas
I can't fix everything, but I can make it so nobody else can
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04-21-2016, 09:17 AM
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#16
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Junior Member
Join Date: Apr 2016
Posts: 9
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Bussmann Hi-Amp Circuit Breaker - Which wire where?
WW, I had to remove the circuit breaker connections as the 2 cables were right on top of the engine battery.
The only other batteries are the coach batteries.
Unfortunately I haven't been able to find any wiring diagram in the manuals.
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04-22-2016, 08:52 AM
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#17
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Senior Member
Join Date: Apr 2012
Posts: 3,275
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Quote:
Originally Posted by geoman
WW, I had to remove the circuit breaker connections as the 2 cables were right on top of the engine battery.
The only other batteries are the coach batteries.
Unfortunately I haven't been able to find any wiring diagram in the manuals.
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G, I'm trying to get my head around this. The photo the other member posted, you see only two cables. Is this the case with your connections? You apparently can't tell which goes to the battery. What I would do is with 120vac power disconnected (don't want to read 12v if being charged by the converter) see if there continuity to ground on one of the cables. It shoud read near zero ohms, not up in the 1000s of ohms. If yes, this should be AUX, if the other read ohms, we haven't proven anything, but try this first.
Put meter on ohms (auto if you have that); one lead on a KNOWN ground; and the other to the cables under test.
If only one cable read continuity (grounded) and one doesn't (or open to ground - no ground); I bet the open one would go to the battery and the one with continuity is a distribution panel.
If you need more info, contact me.
WW
__________________
Hyper Lite was sold
2017 F-250 4x4 6.2L Gas
I can't fix everything, but I can make it so nobody else can
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