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Old 04-08-2017, 04:38 PM   #1
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Chassis Battery disconnect switch

i have a chassis battery disconnect switch mounted under my entry steps in
my battery compartment.

it has always performed and worked properly until now? i tried to turn this
switch this morning and it appears that it is not working and does absolutely
nothing whether turned to the on position or the off position?

it use to beep once when turned to the on position. now no beep nothing?

it seems like this chassis switch is stuck in the on position as i can start my
coach whether it is in the on or off position?

does this mean that the switch is broken or no good anymore?

i am not a electrical person but hope someone will chime in and tell me
if i can fix this switch or will i have to purchase a new switch? this switch
is not really that old maybe 4-5 years old.

maybe Rook will chime in and help me fix it? it is pretty easy to remove as
it only is held in place by 4 screws. the rotary on and off knob seems to be
a little loose and has some play in it. it use to be tighter with no play?

thanks for any help or insight.

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Old 04-09-2017, 05:35 AM   #2
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Based on the symptoms you describe, certainly sounds like it's defective and the inside contacts aren't rotating. It's certainly worth the time to disconnect the leads at the batteries and take it off to see if a simple easy fix.

However, battery disconnect switches are designed to switch hundreds of amps, so the contacts could be pitted, and if so they build up a resistance. This ends up generating heat when large currents are pulled thru them.

I don't know the specific switch you have, but mine were less than 20 bucks, so I wouldn't mess around a whole lot with trying to save the switch, if I was at all in doubt about it's integrity. Not worth being on the road somewhere and then it fails in the open position and you don't have power......and then you're trying to jury rig a temporary solution.

When in doubt, throw it out.
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Old 04-11-2017, 02:10 PM   #3
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chassis battery switch

thanks Dave B for your insight. i took the switch off and took it apart and
it appeared to be working properly as all it does is rotate and make a contact
with 2 bolt heads.

it seems to be working the way it is suppose to work? is there a way i can
test it with a meter to see if it is completing a circuit or not?

it does not seem to matter whether switch is on or off it does not change?

i am now wondering if my wiring to the switch has a short in it?

i have power from my chassis battery continuously whether switch is on or
off?

i guess i could buy a new switch and if it does not turn the power to my
battery on and off i can return the switch? for $20 i will try a new switch?

otherwise i might have to dig into my wiring which i really dont like messing
with that since i am not a electrician and dont like getting zapped.

oh i also tried changing the negative and positive wires to the switch and it
made no difference it still did not disconnect the power to my battery?

thanks again for your help and insight / the saga continues.
i will advise if i get it figured out. thanks
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Old 04-12-2017, 07:00 PM   #4
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Just to be clear, what do you mean when you say "chassis battery"? Are you talking about the battery that starts the engine or the battery that power the inside lights and such?

Should be pretty easy to connect an ohm meter across the switch and measure for open and close with switch operation.
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Old 04-13-2017, 08:04 PM   #5
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yes the 12 volt battery that starts my triton v-10 engine

i did take the switch loose and checked it with my ohm meter and the switch
appears to be good and working as it is suppose to.

my problem is that when i turn the switch to the off position my engine still
starts and will start with the switch being in the on or off position?
i cannot seem to to kill the battery power to my dash and engine? engine
starts right up whether switch is on or off? very strange.

that switch worked fine when i had my old 2 12 volt batteries in the coach.

now i have two six volt batteries for my coach. it should not matter whether
i have 2 six volts or 2 12 volts as these house batteries are on their own
circuit and completely separate from the chassis battery??

i tried switching the wires on the back of the on and off switch and it still
does not matter as i still get power to my engine and dash????

very frustrating? does anyone maybe have a diagram of your chassis
battery to your disconnect switch?? maybe i need to turn my chassis
battery around and try hooking it up that way and see if my switch will
kill the power? i dont know what to do as i am not a electrician but i know
there are some very good and knowledgeable people on this forum that will
chime in and shed some light on this problem?

hey Rook are u out there? help me out here. thanks
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Old 04-13-2017, 08:43 PM   #6
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Quote:
Originally Posted by mr. seaview View Post
i did take the switch loose and checked it with my ohm meter and the switch
appears to be good and working as it is suppose to.

my problem is that when i turn the switch to the off position my engine still
starts and will start with the switch being in the on or off position?
i cannot seem to to kill the battery power to my dash and engine? engine
starts right up whether switch is on or off? very strange.

that switch worked fine when i had my old 2 12 volt batteries in the coach.

now i have two six volt batteries for my coach. it should not matter whether
i have 2 six volts or 2 12 volts as these house batteries are on their own
circuit and completely separate from the chassis battery??

i tried switching the wires on the back of the on and off switch and it still
does not matter as i still get power to my engine and dash????

very frustrating? does anyone maybe have a diagram of your chassis
battery to your disconnect switch?? maybe i need to turn my chassis
battery around and try hooking it up that way and see if my switch will
kill the power? i dont know what to do as i am not a electrician but i know
there are some very good and knowledgeable people on this forum that will
chime in and shed some light on this problem?

hey Rook are u out there? help me out here. thanks
You don't want to wire up the chassis battery backwards or you WILL have major problems. My 2003 Dolphin doesn't have a chassis disconnect switch. Did somebody install this to disconnect the chassis battery? Why? Are you sure it is NOT a house battery disconnect switch? If you disconnect the chassis battery the ecm has to relearn running modes for fuel economy, idle air ect. Not a good idea.
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Old 04-13-2017, 08:55 PM   #7
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If you have your MH plugged in to shore power and have a bi-directional isolation relay, it is starting from your house batteries.

The isolation relay is basicly an automatic jumper cable between the batteries.

If it's not plugged in, then your isolation solenoid is stuck, the boost switch is on, or the wiring is wrong.
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Old 04-13-2017, 09:31 PM   #8
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As twinboat mentioned...are you connected to shore power when this problem occurs?

Also you say you switched from 12 volt batteries to 6 volt batteries. Can you tell me how you wired those new batteries in and is this when the problem started?
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Old 04-14-2017, 10:00 AM   #9
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battery disconnect switch

u know what i am plugged in to shore power. let me try unplugging the mh
from the shore power and see if this helps or makes a difference?

thanks for the insight. i will let you know what happens. thanks again.

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Old 04-14-2017, 01:12 PM   #10
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chassis battery disconnect switch

it does not matter whether i am plugged in to shore power or not it still
does not kill the 12 volt chassis battery?

the switch worked perfectly when i had the 2 12 volt house batteries in the
mh. no i have 2 6 volt golf cart house batteries and the chassis switch is
not working properly? does not matter if switch is on or off it still does kill
my 12 volt chassis battery?? but when i take a reading with my ohm meter
on the 12 volt chassis battery it dopes show that the chassis battery is
disconnected? however i still have dash lights and can still start my engine??

kind of weird?? my motorhome is a 1999 seaview with a v10 motor on
a Ford F53 chassis.

thanks i guess i will just learn to live with it as long as my chassis battery
does not drain? thanks
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Old 04-14-2017, 02:25 PM   #11
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Send some pictures of your battery connections.

Are you sure the Boost or Auxiliary switch is not on ?
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Old 04-14-2017, 04:21 PM   #12
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On my Dolphin the disconnect switch does not kill the chassis batteries, only the house batteries.
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