I had a low battery on the 2003 winnebago adventurer, so I tried to start with the emergency start swith...I did not get any power..Where should I start the troubleshooting??Bud

Did you continue to hold the aux start switch depressed while attempting to start the coach? It's just a momentary switch, not an ON/OFF thing. The switch simply picks the solenoid/relay that bridges the batteries together for charging.

check the house battery disconnect switch...in the stairwell.Maybe house batteries are gone to....check with meter.Should be 12.4 or so

I found, and it was echoed by others on here, that you may need to hold the switch down for a minute or so BEFORE attempting to start. Made the difference for me.

Just a shot in the dark here: Are you sure that at least one battery bank is fully charged? If neither is charged, you won't get any results from the emergency start switch.

What I did was while holding down the emer start switch I turned the key to start but there was no extra power ....The house batteries are good and in the connected mode...Thanks for replys....Isnt there a relay somewhere that I can check for voltage???

Aux start not working | Good Sam Community

15 Replies

Gjac
Explorer III
Jul 20, 2013
wynnd wrote:
Had this problem once on my Fleetwood gasser...turned out to be a corroded negative terminal on the chassis battery.

Good luck with your troubleshooting!
Just had a similar experience with mine not starting with the ign turn on steps would not go out. I new batteries were good and replace both solenoids within the last several years. When I hit the aux start the eng barely turned over. Turned out to be the HF battery cut off on my eng battery was corroded and arcing. Cleaned and all was well again. Let us know what you found out.
wynnd
Explorer
Jul 20, 2013
Had this problem once on my Fleetwood gasser...turned out to be a corroded negative terminal on the chassis battery.

Good luck with your troubleshooting!
drifterpilot
Explorer
Jul 18, 2013
Generator need not to be running. Just push and hold the battery boost switch while cranking the engine.
hershey
Explorer
Jul 18, 2013
crasster wrote:
Do any of you start the generator before hitting the aux button?
No, not necessary if the batteries are fully charged.
crasster
Explorer II
Jul 18, 2013
Do any of you start the generator before hitting the aux button?
427435
Explorer
Jul 18, 2013
Most likely the solenoid/relay near the batteries. The trick is to replace it with a good one. I've had to replace mine twice, but I just used cheap replacements. Get one that is rated for 100% duty cycle as it is also used to charge the house batteries from the engine under some conditions. That will melt the intermittent duty solenoids.
1995brave
Nomad
Jul 18, 2013
Here is the link to the Winnebago wiring diagrams
drifterpilot
Explorer
Jul 18, 2013
The relay is mounted on the back of the step in your battery compartment. When my battery boost switch didn't function, I found the relay was bad.
Jagtech
Explorer
Jul 18, 2013
The relay (mine it looks like a round silver starter relay) should be mounted and wired near the batteries, as the cables have to be kept quite short. Could just be a wire off the relay, or a bad relay. Can you hear the relay click when you press the switch?
JackMS
Explorer
Jul 18, 2013
Not sure where your relay is, but it is easily tested. It should have 2 large posts and 2 small. Based on your problem, one large post should have good voltage and one will be low. When you push the button, one small post should get power-the other is ground. While holding the button, the 2 large posts should start to equalize.