Allison snake eyes

Topic: Allison snake eyes (Read 3422 times) previous topic - next topic

Re: Allison snake eyes

Reply #25 – February 02, 2022, 11:55:02 am

Quote from: John Haygarth – February 02, 2022, 11:47:40 am

Do you think like me that if the coach does not have start issue after snake eyes and drives as normal that a 12v feed issue will cause them...

Sorry - above my knowledge level. Did he actually call John K. and ask his opinion about the observed symptoms?

It would be REALLY nice if he pulled codes form the ECU before removing it. The codes would do more than anything else to point out the probable source of the snake eyes.

Re: Allison snake eyes

Reply #26 – February 02, 2022, 12:00:41 pm

Quote from: Chuck & Jeannie – February 02, 2022, 11:55:02 am

It would be REALLY nice if he could pull codes form the ECU before removing it. The codes would do more than anything else to point out the probable source of the snake eyes.

If the shift pad is showing snake eyes it can not display diagnostic codes.

Yes, is intermittent snake eyes you could check for codes when the display is normal.

Re: Allison snake eyes

Reply #27 – February 02, 2022, 12:13:12 pm

Quote from: wolfe10 – February 02, 2022, 12:00:41 pm

Yes, if intermittent snake eyes you could check for codes when the display is normal.

Which is exactly what I was HOPING was done while the opportunity still presented itself.

The problem has been repeatedly reported as "intermittent" from the start of the thread two days ago.

Re: Allison snake eyes

Reply #28 – February 02, 2022, 01:14:59 pm

No codes were pulled sadly enough, and he has talked with John and although John could not give him any direct answers they are sending them to him as we speak. Roland is helping.
Mel called from Roland's home and I told him to read all the posts put up.
So, thanks to all again as we have done all we can from a distance and will wait for any verdict. Rest assured I will write any and all answers(or non) once it is back.
Chuck, you are right as they were intermittent.
Johnh

Re: Allison snake eyes

Reply #29 – February 02, 2022, 01:37:10 pm

John,

One thing about John K is he won't sell you a pig in a poke. If he checks out the unit and all is good he will tell you that your problem is elsewhere. As we say here in East Texas "he is good people"

Mike

Re: Allison snake eyes

Reply #30 – February 02, 2022, 01:48:16 pm

Quote from: dsd – February 01, 2022, 01:31:31 pm

Transmission Instruments

If you read his web sight they go into really good trouble shooting procedures if followed would be help full. The special test light they describe how to build and would be beneficial to anyone that thinks this is within there trouble shooting skill set (and it is) should have prebuilt and stored away with their spare parts and tool kit. I'm going to make one up soon and a small box to prevent breaking the bulb. The big advantage of a bulb is that it requires some wattage too work were as a volt meter can be fooled and show voltage but drops under any load like the light bulb.

Re: Allison snake eyes

Reply #31 – February 02, 2022, 04:12:31 pm

I think I told this story over a decade ago. Our previous FT would spontaneously show snake eyes. That is a problem. The bigger problem was when it came back on, it shifted to first gear. You might can imagine the jolt you get when you shift into first at 60MPH.

The problem was a failing component in the ECU. Had I found a parking place and sent the ECU to John, it would likely have been a few hundred dollars. Eventually, the board failed more dramatically and was beyond repair. We were LUCKY to pay only $1000 for a used ECU, and equally lucky to find it within about 100 miles of where our coach sat parked and disabled in the emergency lane.

Re: Allison snake eyes

Reply #32 – February 02, 2022, 07:34:52 pm

Scott I made a test light out of an old headlight connection and it has paid off a
couple of times. The standard test light would work but a headlight bulb used to
much current to work.

Re: Allison snake eyes

Reply #33 – February 02, 2022, 08:26:25 pm

Quote from: oldguy – February 02, 2022, 07:34:52 pm

Scott I made a test light out of an old headlight connection and it has paid off a
couple of times. The standard test light would work but a headlight bulb used to
much current to work.

They showed a 1156. Not today but on the list

Re: Allison snake eyes

Reply #34 – February 02, 2022, 09:31:48 pm

This is mine, crude but effective.

Re: Allison snake eyes

Reply #35 – February 02, 2022, 09:59:22 pm

Need to be able to probe the harness
Quote;
Assemble 12V/15-25W light bulb (spare brake lamp bulb or similar – #1156, #1073 etc.) with 20 gauge solid copper wire (ordinary hookup or "bell wire"). Strip 1/2″ on test side. When you check ECU connectors, the lamp must glow bright white light. A dim light will indicate a bad connection somewhere; likely due to oxidization. A voltmeter will not indicate bad connections. An ordinary voltmeter or VOM isn't reliable for this test. However you will need one to check the lower voltage systems.

Re: Allison snake eyes

Reply #36 – February 03, 2022, 08:51:57 am

Don't know if it has been said but there are a number of places if you use a test light you could burn up a circuit board.

I believe HWH has warning all over the place to do not use a test light for checking.

Re: Allison snake eyes

Reply #37 – February 03, 2022, 09:50:53 am

Quote from: dsd – February 02, 2022, 01:48:16 pm

Transmission Instruments

If you read his web sight they go into really good trouble shooting procedures if followed would be help full.

Yes I wouldn't use a sledge hammer to install a windshield either, but he is the man that repairs these units and has been kind enough to provide really good troubleshooting guidance. I personally would be comfortable using his information for that. This was only for that specificity and nothing to do with your HWH. DWMYH.
Scott

Re: Allison snake eyes

Reply #38 – February 03, 2022, 02:38:59 pm

Yes John is known to be honest as it goes with the name, lol
I did read his info on website.
Johnh

Re: Allison snake eyes

Reply #39 – February 06, 2022, 11:00:28 am

Roland emailed me to say that they did the testing as mentioned on John's website and it showed that there was damage on the equipment, so in a way that is nice to know that the problem is most probably all in the units Sent to be repaired.
Johnh

Re: Allison snake eyes

Reply #40 – February 07, 2022, 10:01:18 am

Mel and I did the test and the light shined brightly. The repair shop should get the equipment today. In our haste to ship the units we neglected to ship overnight. Or maybe not as Mel is helping me with our bathroom remodel today. 😁

Roland

Re: Allison snake eyes

Reply #41 – February 07, 2022, 12:43:02 pm

Roland, work him hard as he owes you!!!!!
John

Re: Allison snake eyes

Reply #42 – February 07, 2022, 10:19:32 pm

I believe that the package arrived in Texas this morning so maybe it will be back in Ajo Wednesday. Here's hoping for them.
Johnh

Re: Allison snake eyes

Reply #43 – February 08, 2022, 12:03:52 am

Package was delivered at 10:45 this morning.

Roland

Re: Allison snake eyes

Reply #44 – February 11, 2022, 01:15:35 pm

Well after a week the parts are back and NO issues where Found by John and I guess no codes thrown. Mel informs me he has put it back together but have not heard if it is working but assume it should. He feels confident it will get him down here Saturday, so hope it does. I am now back with the mindset that he has alternator/charging issues as it was replaced 2 yrs ago by a Delco Remy one but he told me the excite wire etc was not hooked up but it was working!!!
I will wait till he gets here and find the model then see, or get back to this group of experts to sort it out as he cannot go on this way.
My thought is that if the ecu sees low voltage it would show cats eyes, so does anyone have any knowledge of this to give me something to work on ?.
Johnh

Re: Allison snake eyes

Reply #45 – February 11, 2022, 01:25:12 pm

Quote from: John Haygarth – February 11, 2022, 01:15:35 pm

My thought is that if the ecu sees low voltage it would show cats eyes, so does anyone have any knowledge of this to give me something to work on ?.

Sorry, nothing here. AFAIK cat eyes means ECU is broken. If it's not broken and still showing cat eyes, even if intermittently, then that's above my knowledge level.

But, as you say, it's certainly something that must be straightened out, one way or the other, by someone.

Re: Allison snake eyes

Reply #46 – February 11, 2022, 02:29:52 pm

If John said the ECU and shift pad check out, that really points to a connection/wiring issue.

Check pins CAREFULLY and look for any evidence of rodent damage to wires.

Re: Allison snake eyes

Reply #47 – February 11, 2022, 02:30:04 pm

Mel started his coach this is morning after installing the Allison ICU. I checked the battery voltage on the dash and it indicated 12 volts. Turned the lights on bright and the voltage dropped a bit and did not rebound. Voltages was never above 12 volts. Measured the voltage at the batteries. House voltage was 13+ chassis voltage was just about 12 V maybe a bit more. I suppose we should have checked the chassis battery with the coach running but it was reading just about the same a the dash meter so we did not. Didn't think about it actually as Mel decided that he would drive down to Mexico with the boost switch turned on. He's got a solar panel powering that battery bank so I believe he will be OK. But that's just me. I drove our coach for six months with a bad alternator without getting stranded. Never at night naturally. Mel has a three to four hour drive with bright sunshine so they should be OK.

Roland

Re: Allison snake eyes

Reply #48 – February 11, 2022, 02:36:12 pm

Roland, so have they left to drive down now, as was expecting them to come tomorrow
Johnh

Re: Allison snake eyes

Reply #49 – February 11, 2022, 02:36:29 pm

Brett, when Mell installed the ICU he put both connectors on, of and on again eight times, he actually counted. He does have an at alternator issue for sure whether that is causing his snake eyes remains to be seen I suppose.

Roland

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