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Old 03-05-2016, 06:11 PM   #1
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Engine Quits When Brakes Applied

Took my 04 Winnebago Ultimate Freedom out of the garage for short trip. Beautiful day. Beautiful unit. Cummins ISL runs beautifully at idle.

Step on brakes and engine dies. Put on emergency blinkers and engine dies. Restart and same thing happens every time.
Happens with transmission in Park, Drive, and Reverse.

Anybody have this experience, or know what is going on?
Thanks.
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Old 03-05-2016, 06:20 PM   #2
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Is your engine or exhaust brake kicking on at idle ?

Make sure the throttle drops to idle and the engine brake is off.
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Old 03-05-2016, 06:29 PM   #3
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Quote:
Originally Posted by twinboat View Post
Is your engine or exhaust brake kicking on at idle ?

Make sure the throttle drops to idle and the engine brake is off.
Engine brake is NOT on.
Problem happens at idle also.
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Old 03-05-2016, 06:36 PM   #4
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Sounds more like a "Electrical" problem than mechanical..........
Any and all plug connections, battery terminals, grounding points would be the first thing I would clean and spray with a good electrical spray. Try and find your big plugs to the ECM & the TCM and unplug them, clean and spray.
(Engine control module and Transmission control module)
Are the batteries right up to full charge?
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Old 03-05-2016, 06:40 PM   #5
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Check battery and alternator voltage, Cummins ECM's need 10.8 volts MINIMUM !!! to maintain engine operation. If your alternator volts are low or batteries questionable , any load that drops the voltage supplied to the ECM below 10.8V will stall the motor . Even bad grounds could cause this issue.

EDIT. I see palehorse , posted the same info while while I was typing.
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Old 03-05-2016, 08:16 PM   #6
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My experience with a similar problem turned out to be the terminal block (actually round) on the external firewall in front of the drivers left foot. It is a multi-cable connection block. You open the generator hood, and with a flashlight look up high near the port side of the firewall to see this terminal block with 4 battery cables attached.
It just suddenly began killing the engine at a rest stop. I phoned Good Sam ERS, the guy arrived and began trouble-shooting. After a hour he finally discovered this terminal block and checked the nuts on the posts. One nut was ready to fall off the stud, the other was loose about 3 threads.
My initial problem was: when I put the Allison in gear the engine would die. This worsened every time I attempted to get underway, until it would not have power to anything in the instrument panel or the tranny console.
That little episode cost ME $135, GS paid the trip charges.
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Old 03-05-2016, 08:23 PM   #7
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Your batteries and cables should be good since it starts fine.

Put a voltmeter on the chassis batteries, you should see about 14v when engine us running..

Check if headlights kill the engine.
If yes start checking for good connections starting at the alternator and work back.

A poor connection drops more voltage as the load increases.

Regards,

Dan
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Old 03-05-2016, 08:34 PM   #8
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Try holding your aux start button and then touch your brakes. If it keeps running, you have a voltage issue as suggested.
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Old 03-05-2016, 08:40 PM   #9
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Keep us updated on what you find...
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Old 03-05-2016, 09:30 PM   #10
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A few thoughts.

The 4 way flashers flash the rear brake lights, on some MHs. If not there, in the trailer connector.

The engine brake turns on the brake lights, on some MHs.

An engine brake can stall an engine at idle.

You step on the brake or turn on the flashers and the engine stalls.

Just a coincidence ?

Have you tried stepping on the throttle a bit, while stepping on the brake ?

Pull the brake light fuse and see what happens ?

Disable the engine brake and see what happens ?

Good luck and keep us posted.
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Old 03-06-2016, 07:48 AM   #11
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Thanks for all the replies.
Haven't had a chance to check everything out yet.

So far:
Doesn't shut down with all lights on, just brakes and/or flashers.

DOES shut down with engine at fast idle, 2K and brakes on.

Battery reads 14V with engine idle.

Pulled the brake light fuse. Same thing happens. Shuts down.
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Old 03-06-2016, 08:47 AM   #12
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Quote:
Originally Posted by Sealevel Ram View Post
Thanks for all the replies.
Haven't had a chance to check everything out yet.

So far:
Doesn't shut down with all lights on, just brakes and/or flashers.

DOES shut down with engine at fast idle, 2K and brakes on.

Battery reads 14V with engine idle.

Pulled the brake light fuse. Same thing happens. Shuts down.
After this info, Twinboat has the most likely cause, something causing the engine brake to activate. Can you get a test light on the solinoid for the engine brake to see if it gets activated? Pulling the brake light fuse may still allow it to com on.

Dan
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Old 03-06-2016, 11:47 AM   #13
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Quote:
Originally Posted by dpinvidic View Post
After this info, Twinboat has the most likely cause, something causing the engine brake to activate. Can you get a test light on the solinoid for the engine brake to see if it gets activated? Pulling the brake light fuse may still allow it to com on.

Dan
Pardon my ignorance. Are you talking about the "jake brake"?
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Old 03-06-2016, 02:03 PM   #14
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Quote:
Originally Posted by YC1 View Post
Try holding your aux start button and then touch your brakes. If it keeps running, you have a voltage issue as suggested.
Did this.
Still dies.
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