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Old 10-06-2016, 11:55 AM   #1
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Aux start switch not working

1999 Fleetwood Bounder aux start button not working. Had a problem with "Grounds" and had new ones installed. The jacks would not work, transmission would not shift properly etc. Everything works after the new grounding kit was installed. Is there a fuse in the aux start circuit that could be blown? Any information would be appreciated.
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Old 10-06-2016, 12:25 PM   #2
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Are you talking about a remote start for the generator or the main engine? If a generator, what type, model? If main engine, what chassis, engine? A bit more information would help us help you.
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Old 10-07-2016, 11:04 AM   #3
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This is a 1999 Fleetwood Bounder with a Ford V-10 engine on a Ford chassis. This is the paddle switch on the dash for a boost when the main battery does not fire the engine. The aux switch is supposed to use the 2 6 volt batteries to boost the main 12 volt battery.
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Old 10-07-2016, 11:08 AM   #4
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The Aux button just sends (12VDC) to a solenoid most likely. You probably have two or more solenoids. You just have to figure out where it is.
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Old 10-07-2016, 11:25 AM   #5
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It is perhaps the same solenoid that connects house and chassis batteries together when a charging current is detected. If you get ears near the solenoids and someone pushes the dash button, see if you hear a clicking sound. Often the solenoids will have fuses installed right on them.
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Old 10-07-2016, 12:44 PM   #6
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Or perhaps the Auxiliary Switch is working, if you had the ground repaired, perhaps they missed reconnecting the coach battery feed to the chassis?

If you have a multimeter, an someone holds the Auxiliary Switch on for you, you should detect an increase to the chassis battery.

And as mentioned, yep, other components between the switch, and the feeds between the batteries - it could have a problem too!

Best of luck to you, and please update what you find out, as it could help others in the future...

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Old 10-08-2016, 08:48 AM   #7
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My 99 Bounder switch does not work either. I suspect the solenoids located behind the BCC circuit board. Do the manual battery disconnect switches work properly?
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Old 10-08-2016, 09:09 AM   #8
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Aux. start = emergency start on many coaches. Same function.

It's a simple circuit. The switch (whatever way it's marked) sends power to a solenoid (which generally looks like a starter relay) which are often mounted under the hood on the firewall. That power energizes the relay, which connects the main and aux batteries together for as long as you hold the switch.

Problems often seen are burnt out relays, relays mounted to wood that have lost their ground, and bad connections.

Troubleshooting, generally with a test light or volt meter, will generally identify the issue pretty quickly/easily.
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Old 10-09-2016, 08:29 AM   #9
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I had a 99 Windsport with the Ford Chasis and Triton V-10. In the Battery Control Center under the front hood there is plastic box covering the solenoids. There is a fuse (5 or 10 amp?) that the Battery Boost goes through to activate the solenoid. The fuse is located in this box next to the solenoids - you may want to check the fuses. If you press the button and hear a click, then the fuse is probably OK and it may be the solenoid itself. I had a solenoid that would click and engage, but when I tore it apart it was corroded and not making electrical contact even though it was activating. I replaced the solenoid and all was well.
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