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09-23-2017, 05:18 PM
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#1
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New Member
Join Date: Aug 2014
Posts: 3
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Emergency Start Switch
We have an emergency start switch which was shown as an option installed by the manufacturer. There is nothing in the Owners manual so have no clue what it is for. Thanks for any info.
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09-24-2017, 12:31 AM
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#2
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New Member
Join Date: Jan 2011
Location: B.C. Canada
Posts: 27
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If your vehicle battery is inoperable (dead), you can use the emergency switch, which uses your house battery(s) to start your vehicle
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10-08-2017, 06:42 PM
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#3
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Senior Member
Join Date: Aug 2017
Location: Memphis
Posts: 751
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I have also used it to start the generator, when the coach battery was going bad. HANDY, but you do not need to leave it on all the time, it bypasses the diodes that prevent undesired discharge
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02-16-2023, 08:42 PM
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#4
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Member
Join Date: Sep 2022
Posts: 30
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Use to trickle charge engine battery?
I know you could turn on this emergency start switch to jump start the engine battery. BUT is it good idea to leave it on for a few hours from time to time in order to trickle charge the truck(engine) battery?
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02-17-2023, 02:37 AM
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#5
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Senior Member
Join Date: Aug 2017
Location: Memphis
Posts: 751
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I DO EXACTLY THAT WITH MINE OCCASIONALLY, to occasionally top off my chassis battery, and it is Continuous Duty RATED. I did replace my SOLENOID last year, as it wud CLUNK but not connect, however, it was 22-yo. It can also be the Other way at 5am to start GEN when the furnace ran your coach battery down
__________________
THenne1713
2000 Conquest LE 6266, Class-C on 99-E450SD, 6.8, 2v, V-10
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02-17-2023, 08:41 PM
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#6
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Member
Join Date: Sep 2022
Posts: 30
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Quote:
Originally Posted by THenne1713
I DO EXACTLY THAT WITH MINE OCCASIONALLY, to occasionally top off my chassis battery, and it is Continuous Duty RATED. I did replace my SOLENOID last year, as it wud CLUNK but not connect, however, it was 22-yo. It can also be the Other way at 5am to start GEN when the furnace ran your coach battery down
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That's good to know! Mine is old too and I hope I wont have to hear that clunk anytime soon.Thanks.
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02-19-2023, 09:56 AM
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#7
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Member
Join Date: Aug 2020
Location: Rio Rico, AZ
Posts: 63
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Bi-directional?
My switch is spring loaded (wrong term) so I have to hold it down to start. It hadn’t occurred to me that you could use it to start the generator when the coach battery is low.
2004 BT Cruiser 2051
The switch is quite a clever function.
__________________
Bill
Rio Rico, AZ
2004 BT Cruiser 5210
Class C
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02-19-2023, 11:16 AM
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#8
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Senior Member
Join Date: Dec 2009
Posts: 1,027
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Yes the emergency start switch is a momentary function requiring it to be pressed to work, and returning to OFF when you stop pressing. This is as it should be, because connecting batteries of different ages, types and manufacturers in parallel long term is detrimental to performance, cell life and charging response.
The emergency start switch is a relay/solenoid implemented equivalent to jumper cables...and as such should be used only when needed and for short duration.
Chuck
__________________
2007 Tour Master T40C
Acura MDX toad
"It takes a great deal of time to recover from any improvement..."
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02-20-2023, 11:53 PM
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#9
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New Member
Join Date: Aug 2022
Posts: 14
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Quote:
Originally Posted by THenne1713
It can also be the Other way at 5am to start GEN when the furnace ran your coach battery down
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Unless at 5am your batteries were completely toasted by the furnace to the point the generator wouldn't stay running without the switch held or a booster pack on the house batteries....... doh!
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02-22-2023, 02:27 AM
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#10
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Senior Member
Join Date: Aug 2017
Location: Memphis
Posts: 751
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Sounds like CONVERTER OFF/ TRIPPED? (because e.g.) my old, old Magna says it can put the full 45a into battery when needed, so once GEN started & online, CONVERTER SHOULD take over all 12vdc FUNCTIONS NEEDED. Even if you have the smaller 25a max?
__________________
THenne1713
2000 Conquest LE 6266, Class-C on 99-E450SD, 6.8, 2v, V-10
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03-05-2023, 11:38 AM
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#11
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Senior Member
Join Date: Apr 2021
Posts: 279
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I agree with "Chuck V" the E-start switch engages the solenoid that connects house to chassis batteries AND it is an >INTERMITANT< duty solenoid, not a continuous duty solenoid. Used to start your coach when the chassis is low, using the house batteries. You can burn it out prematurely using it long term to charge both banks. Better to get a DC-to-DC battery charger and connect it to charge chassis batteries (from house side) while plugged into shore power.
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03-05-2023, 01:08 PM
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#12
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Senior Member
Join Date: Dec 2009
Posts: 1,027
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Manual use of the 'emergency start switch' should be limited to short duration as noted several places above and for those RVs that do not have a shore power means to charge the chassis battery can be added as I did.
There is another battery interconnect system that exists in most rigs however that allows the engine alternator to charge all battery banks when the engine is running, and this system has a controller to ensure that the connection is only present when charge conditions are appropriate for the various banks. This capability is usually called a "BIRD" which is an acronym for Bidirectional Isolator Relay Delay and the controller has both delay times and threshold voltages to actuate and stay actuated. This is far different than the 'unattended' or manual emergency start switch.
Chuck
__________________
2007 Tour Master T40C
Acura MDX toad
"It takes a great deal of time to recover from any improvement..."
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