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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #1  
Old 04-07-2019
toolmaker toolmaker is offline
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Default 12 V intermittent failure.

Yesterday and just now all 12v lights, fans shut off. Only three fixtures on and the bath exhaust fan. Batteries fully charged showing 12.7 volts and terminals clean and tight. Both times this happened I cycled the ignition on and off and power came on. House 120v not affected either time.
Neither time did I attempt to start the engine.
Guests still sleeping so can't report now if the engine start will happen or not.
Any thoughts on where to begin the troubleshooting ?
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Paul Cambron
Hot Springs National Park, Arkansas
1996 BMC 40
fmca 200288
eglider03@gmail.com
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  #2  
Old 04-07-2019
rshrimp rshrimp is offline
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Sounds like burnt contacts on one of the relay/solenoids. 12v master, or ign.
That's where I would start.
Think about what relays are exercised when the ign is cycled.
12v masters come to mind first (If BMC's have them????)
Those big constant duty solenoids can get burnt contacts
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Randy and Sonya Shrimplin
FMCA# F457849
Livin' the dream, next door to the Drysdale's in Beverly Hills FL!
2000 LX40 ME "Angry Bird!"
Body# 129047
RShrimp@Yahoo.com
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  #3  
Old 04-07-2019
toolmaker toolmaker is offline
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More clues on the way home.
House 12v power failed while driving then came back on in 15 min or so. So earlier turning ignition on/off was probably a coincidence.
No dash area/front 12v plugs affected . Circuits affected are from rear panel.
Now thinking the culprit could be a auto reset breaker back on the right side engine bay, under the bed. Do those age out,get weak ?
I did replace that 12v 200a continuous duty relay located back there 2 years ago.
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Paul Cambron
Hot Springs National Park, Arkansas
1996 BMC 40
fmca 200288
eglider03@gmail.com

Last edited by toolmaker; 04-07-2019 at 02:17 PM.
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  #4  
Old 04-15-2019
toolmaker toolmaker is offline
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Called Spartan and they provided these schematics.
Fellow BMC owners you might want to print these and put them in your files for future reference.
Have not had time yet to work on my 12v intermittent failure but hoping these drawings will help.
Any suggestions appreciated.
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Hot Springs National Park, Arkansas
1996 BMC 40
fmca 200288
eglider03@gmail.com
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  #5  
Old 04-15-2019
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Trees Trees is online now
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Thanks Paul. If you go here, scroll down to BMC, and there are more schematics for BMC 40.
https://www.wanderlodgeownersgroup.com/downloads/
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Tim Rees
Elida, Ohio
1995 BMC 37
F110660
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  #6  
Old 04-15-2019
rshrimp rshrimp is offline
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Remember that, without a doubt, BlueBird added a couple more relays into each circuit, just in case!
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Randy and Sonya Shrimplin
FMCA# F457849
Livin' the dream, next door to the Drysdale's in Beverly Hills FL!
2000 LX40 ME "Angry Bird!"
Body# 129047
RShrimp@Yahoo.com
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  #7  
Old 04-15-2019
GregOC GregOC is offline
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Sounds like a self resetting silver fuse that is powering a relay switch. If you narrow the flickering electric to a relay or solenoid, find the fuse that protects the switch leg on that devise.

,

If it is a selfreset fuse popping, could be tripping because it is protecting the line or the fuse material is muffed. If it is protecting, you may be able to shoot temps of the fuses and get lucky to find which one it is
If you find a fuse popping, replace the auto reset with a plastic fuse of same amp 5 amp smaller and keep an eye on the test. If same pops, the fuse is a result of some other issue on the demand side
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  #8  
Old 04-16-2019
toolmaker toolmaker is offline
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Thinking back to that power failure we noticed the Thinlite over the dinette was out. Believe that to be on the rear 12v panel.
Start pulling breakers until that light goes out then replace the breaker seems like the next step. Maybe I'll get lucky and that will be that.
I do have a thermal gun and never would have thought to use it on a breaker. Thanks Gregory for that tip.
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Hot Springs National Park, Arkansas
1996 BMC 40
fmca 200288
eglider03@gmail.com
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  #9  
Old 04-16-2019
rshrimp rshrimp is offline
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Sounds like it's time to get the wifey to spring for one of these!

https://www.amazon.com/dp/B07DMK1ZKP...i-a=B07DMK1ZKP
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Randy and Sonya Shrimplin
FMCA# F457849
Livin' the dream, next door to the Drysdale's in Beverly Hills FL!
2000 LX40 ME "Angry Bird!"
Body# 129047
RShrimp@Yahoo.com
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  #10  
Old 04-28-2019
toolmaker toolmaker is offline
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Replaced the Eaton, master switch controlled solenoid with a Cole Hersee 200 amp continuous duty and all seems well. The Eaton had some corrosion and was 23 years old. We took it apart and no wonder those are $100.00; very robust made in USA design.
Will post again if we have another failure.
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1996 BMC 40
fmca 200288
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