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Old 06-02-2016, 04:58 AM   #1
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TPMS Systems; Tire Minder TM-66

We used this system on our 5th wheel for the first time last month. System worked flawlessly as advertised. Was able to monitor the 4 tires on our 5th wheel; Pressure and Temperature.
Curious thing happened on the way home. We stopped at a truck stop to fuel and restroom break. About 125 miles into the trip. Outside temps were 80 deg.
I did my normal walk around and also checked bearing temps with laser temp gun. Everything was fine. Pressure baseline for our rig is 80 PSI cold. Set that into the TM66 system. Average pressure increase driving is about 8 psi. All expected.
What occurred next was a little disconcerting. We started to pull out and got a "Leak" alarm. It indicated one tire had a leak, yet it was showing 6 PSI above the baseline. We pulled in between semi's at the rest stop to check, but the alarm then cleared. Thought maybe we picked up on a tire transmitter on another vehicle nearby with the same system.
I called Tech Services when we got home to inquire. They indicated this is normal when driving a long distance and stopping. As the tires cool down they also loose pressure. Any tire that looses 3psi in 2 minutes sets a alarm. I asked them why this occurred when it was still above the 80 PSI baseline. They indicated this was just a "Feature" of the system.
I researched and found TPMS systems from factory on cars register a alarm only when they fall below the "Cold" recommended pressures. I think 25% below. That's what I would have expected. I'm going to pursue this a little further with Tire Minder. This isn't a feature I found beneficial.
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Old 06-02-2016, 08:00 AM   #2
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I just purchased an EEZRV TPMS, and it indicates this potential in the manual. It hasn't happened yet, but I suspect it will once the weather warms up more.
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Old 06-02-2016, 08:08 AM   #3
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I have found the same problem. Stopping or slowing for in town traffic the pressure will drop easily 3 lbs from the hot running pressure and set off the alarm. Unfortunately I have learned to ignore the warning and flashing red light.
I don't find it a "feature" either but as I understand it it can't be changed.
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Old 06-02-2016, 08:15 AM   #4
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We had so many other 'features' with the tireminder 66 system, it's off the coach and in the garage...

What good is a warning system if you can't tell if it's a 'real' warning or not ?

They tried to help, but after crawling under the coach for the 4th time a reprogramming all the sensors again... enough was enough...

The last trip we took in March, we would have stopped every few miles if it was to be believed....

I consider it lesson learned money
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Old 06-02-2016, 08:36 AM   #5
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I wish I could deactivate the audible alerts. Annoying and upsets the animals.
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