Troubleshooting TST 507 TPMS That Is Not Picking Up A Signal And Booster Shows Red Light

Question

Question:

I have a tst 507 installed on my 5th wheel since @2021, last week we took a trip and it worked fine on the way there, but coming back my display is not picking up a signal, the booster is still showing a red light. Can you help me troubleshoot this problem?

asked by: Greg G

0

Expert Reply:

Hey Greg, thanks for reaching out. Since the system worked on the way there and then quit on the way home, I'd start with the easy stuff. The red light on the repeater tells me it's getting power, but it doesn't necessarily mean it's talking to the monitor. I'd replace the batteries in the monitor first, then power it completely off and back on. After that, check that the repeater's antenna is still tight and that none of the wiring has come loose or been damaged.

If everything looks good there, I'd pull one sensor off a tire and see if the monitor picks it up. If it isn't seeing any of the sensors, then you're probably looking at an issue with the monitor or the repeater rather than the sensors themselves. Check all that and let me know your findings. I am here to help continue to troubleshoot if needed.

What kind of 5th wheel do you have?

expert reply by: Jesse M

0

Greg G.

7/24/2026

I have a montana 38' fifth wheel. Thanks for your response I will try that, not sure I know how to replace batteries in the monitor mine plugs in to the truck and has batteries also. it doesn't work either way. I cant find anything in my Book about those batteries, just the ones in the sensors. could all of the sensor batteries die at the same time? Thanks, Greg

Jesse M.

7/24/2026

@GregG I mean the batteries in the sensors do go bad eventually but all of them dying at the exact same time seems like a bit of a stretch. Have you replaced the sensor batteries before?

Greg

7/25/2026

@JesseM No I have not Replaced any batteries

Jesse M.

7/27/2026

@Greg Gotcha. I'd try replacing them then and see if that fixes the problem. Also try disconnecting the monitor from power for a few minutes then reconnecting. Let me know if that works.

See All (5) Replies to Greg G. ∨

Mark B.

7/25/2026

I have a 2017 Airstream 28’ trailer since 2021. The TPS has worked great with no issues even on rubber extensions. I have had to replace the batteries only once in the past five years.

Answer 1

They Thomas, I'd be glad to help you pick out which tire pressure monitor system would be better for you. So generally what we have found is that the TST system part #TST-507-RV-4-C is a bit more rugged and will withstand a little more abuse…

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Answer 2

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Answer 3

Hey Joe! Internal sensors typically last longer, are shielded from the elements, and will get a slightly more accurate reading. They also provide protection against theft if that is a concern. The down side is you have to remove the tire to mount…

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Answer 4

Hi Cindy! Better can be a relative term when it comes to things like this. Internal sensors like those found in the Tuson Towable Tire Pressure Monitoring System - 4 Sensors - Brass Interchangeable Valve Stems #335TPMS4WIVS and TST TPMS - Color…

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Answer 5

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Answer 6

I reached out to the manufacturer, TST, about the Signal Booster for TST TPMS #TST-507-R, who told me the following: 1) The repeater does come with an inline fuse on the positive (red) wire. 2) All current repeaters do come with ring terminals. 3)…

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Answer 7

Yes, you would need to install the signal repeater that comes with the TST TPMS for RVs #TST-507-RV-4-C that you referenced to ensure the monitor always has signal/reception. Especially since you plan to use it with a trailer as well. The repeater…

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Answer 8

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Answer 10

Hello Joe, Thank you for reaching out! The Power Mountain Tallboy Off-Road Bottle Jack - 11-5/16" to 27-1/16" Lift - 12 Tons #PM94FR does have the capacity you’d need, but since your fifth wheel’s frame sits about 25" off the ground,…

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Troubleshooting TST 507 TPMS That Is Not Picking Up A Signal And Booster Shows Red Light

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