Moondog1

Started up the Marauder after it rested in the snow for the last 4 months. Went for spin and could immediately tell there was something wrong. The car had allot of bounce.
When I got out of the car it was obvious that the rear end was sitting low. So clearly the RAS has a problem.
Although there are some excellent "Body of Knowledge" articles on this site, none deal directly with troubleshooting.
This where i need some help. These are my observations:
- rear end is sitting very low
- RAS compressor does not cycle
- there are NO dash indicator lights

Any suggestions would be appreciated.

Bert

What year is it?

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Bert

Moondog1

2003 Merc Marauder

Bert

I'll see what I can find out tomorrow.

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Bert

Stick462

Get your self some luiqid soap in a spray bottle and jack and support the frame of the car Block the front wheels.Start the car and Check that the RAS ride control valve is free bye unbolting the ride lever on the axle and try moving it bye pushing it UP .TThis should help you find your problem .here should be some resistance on the lever but not a lot and as you move lever up the RAS should expand the air bags.Check now if the compresser is running. If the compessor is running and it is still not inflating it is now time to use the soapy spray bottle to check for leaks along all the air lines and coupling connections starting from the back of the car.

Bert

Follow Stick462s advice and also check fuse 16 inside and 114 under the hood.

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Bert

Moondog1

Update:

Fuse is fine.

I pulled the RAS relay and jumpered 30 to 87. This should put power to the compressor and cause the compressor to run. The compressor did not run.

I plan to pull out the compressor and bench test it.

Sound right?

Bert

That should turn it on if there's power in pin 30.

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Bert