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Old 01-21-2018, 10:31 AM   #1
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Air pressure

My rear pressure gauge reads 60 and my front pressured gauge reads 90. Should they be different and what is the correct reading? The needles also bounce up and down as I hit bumps. I assume this is normal. 🤨
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Old 01-21-2018, 01:46 PM   #2
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Is this a new issue, 60/90 psi? Have you ever seen anything higher? I believe the pressures should be 125-130 or so.
Locate the air sending units and swap the leads, and see if the low side then reads the higher pressure. The air sending units can be located in several locations. Either under the front hood or perhaps around the drivers front wheel is a good place to start your search. They might be attached to a manifold with an air line to each unit on one side and a quick disconnect plug on the other side, probably with two wires.
I have a different MH than yours is the reason for the uncertainty of where things are located.
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Old 01-21-2018, 03:48 PM   #3
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This the Alpine Coach forum. You didn't include your coach model and year.
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Old 01-21-2018, 03:54 PM   #4
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The OP has a 1998 36SDS.
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Old 01-21-2018, 04:59 PM   #5
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The gages were an add-on by a previous owner. Yes, it is normal for pressure to vary as you go over bumps and/or as the coach sways side to side.
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Old 01-21-2018, 05:11 PM   #6
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Quote:
Originally Posted by TheKassman View Post
My rear pressure gauge reads 60 and my front pressured gauge reads 90. Should they be different and what is the correct reading? The needles also bounce up and down as I hit bumps. I assume this is normal. 🤨
Is your engine running, or off?
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Old 01-22-2018, 10:25 PM   #7
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Yes engine is running
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Old 01-22-2018, 10:26 PM   #8
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Gauges were not an add on. Factory gauges.
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Old 01-23-2018, 05:56 AM   #9
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The gauges are most likely indicating the pressure being carried in the air suspension.

If that's the pressure that maintains the proper ride height, its normal.
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Old 01-23-2018, 08:17 AM   #10
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The gauges are most likely indicating the pressure being carried in the air suspension.

If that's the pressure that maintains the proper ride height, its normal.
Never seen air pressure senders installed there. They should be on the tanks and should range from cut-in PSI to cut-out PSI of around 105-115.

Start by verifying whether this is a gauge issue or air pressure is actually that low. For example, use a tire gauge to check pressure at the coach's air chuck.
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