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Old 03-06-2016, 02:39 PM   #15
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Quote:
Originally Posted by Sealevel Ram View Post
Pardon my ignorance. Are you talking about the "jake brake"?
Yes, a Jake brake activation will stall the engine.
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Old 03-06-2016, 02:43 PM   #16
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Well, one good thing about this problem is that it is consistent and does it without having to be moving.
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Old 03-06-2016, 03:15 PM   #17
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Quote:
Originally Posted by twinboat View Post
Yes, a Jake brake activation will stall the engine.
Don't understand.
The engine doesn't stall when you activate the Jake while driving. Does it just happen at low speed?
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Old 03-06-2016, 03:43 PM   #18
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If you have a compression brake, applying it does shut off the engine.
It stays turning from the MH rolling. If your not moving the engine dies.

This is only theory, I don't know that this is your problem. I am just suggesting things to check.
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Old 03-06-2016, 03:50 PM   #19
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The ECM and the TCM should not let the engine brake engage while sitting still. Most all are programmed to disengage at 5 mph(or higher) with these automatic Allison transmissions.
Get into your fuse box's and find the engine brake fuse, pull it, see what happens. A least this will eliminate the engine brake as the cause.
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Old 03-06-2016, 08:01 PM   #20
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Quote:
Originally Posted by twinboat View Post
If you have a compression brake, applying it does shut off the engine.
It stays turning from the MH rolling. If your not moving the engine dies.

This is only theory, I don't know that this is your problem. I am just suggesting things to check.
Thanks for the info.
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Old 03-06-2016, 08:03 PM   #21
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Quote:
Originally Posted by palehorse89 View Post
The ECM and the TCM should not let the engine brake engage while sitting still. Most all are programmed to disengage at 5 mph(or higher) with these automatic Allison transmissions.
Get into your fuse box's and find the engine brake fuse, pull it, see what happens. A least this will eliminate the engine brake as the cause.
Thanks, I will do it tomorrow.
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Old 03-07-2016, 05:43 PM   #22
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This is the OP speaking.
I have a new entry in my book of life's little lessons:

"WHEN YOU TAKE OUT A DIODE TO TEST IT, ALWAYS REMEMBER TO PUT IT BACK IN THE ORIGINAL AND CORRECT ORIENTATION".
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Old 03-07-2016, 05:51 PM   #23
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Quote:
Originally Posted by Sealevel Ram View Post
This is the OP speaking.
I have a new entry in my book of life's little lessons:

"WHEN YOU TAKE OUT A DIODE TO TEST IT, ALWAYS REMEMBER TO PUT IT BACK IN THE ORIGINAL AND CORRECT ORIENTATION".
So........can we say you have found your problem and all is OK now?
If so, why were you testing the diode to start with?
On mine, that diode is there to turn on the brake lights when the engine brake is in use..........
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Old 03-07-2016, 06:10 PM   #24
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So........can we say you have found your problem and all is OK now?
If so, why were you testing the diode to start with?
On mine, that diode is there to turn on the brake lights when the engine brake is in use..........
Yes, that solved that particular problem.
I had tested the diode several days ago because I was looking at other problems I am having. Not really sure what it does.
I may be making more entries soon.
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Old 03-07-2016, 07:00 PM   #25
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Yes, that solved that particular problem.
I had tested the diode several days ago because I was looking at other problems I am having. Not really sure what it does.
I may be making more entries soon.
It probably blocks a backfeed from the brake lights to the Jake brake.

Over 40 years ago I worked with an old time mechanic. He always reminded me ,
"Always look where the last guy worked, even if it was you."
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Old 03-07-2016, 07:55 PM   #26
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That would do it.
The diode is there as a one way gate.
Putting voltage on the Jake brake will also pass that voltage to the brake lights, but not allow the voltage on the brake lights to go the other way which would activate the Jake and kill the engine.

Obvious now that we think about it...but who would have thought yesterday

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Old 03-07-2016, 08:21 PM   #27
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All this about a compression brake is confusing. We are talking about an exhaust brake NOT an engine (JAKE) brake. The Cummins ISC engine cannot be fitted with a Jake (engine) brake.
Back to the original topic; SeaLevel Ram I'm glad you solved this problem.
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Old 03-07-2016, 09:33 PM   #28
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Here is more confusion

http://www.jacobsvehiclesystems.com/...xhaust-brakes/

The label on the dash switch says Jacobs
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