I get an "intermittent" check suspension light on

If you have an intermittent check suspension message, the absolute best way to find out whats wrong is to pull the code(s) from the module. Unfortunately, most of us don't have access to a $2500+ scanner to do this.

One thing I recommend to check is for power at the big red wire on the compressor side of the harness shortly after starting the vehicle. If you aren't getting power to the compressor, it is possible the relay is damaged inside, can't be revived and needs replacing, but the first thing I would check before shelling out $110-$130 at the "stealership" that is fairly easy to do and dirt cheap, is to check for corrosion on the air suspension compressor relay connector. The location Ford chose to put the air suspension compressor relay is not the best possible place for an electrical part, but I think they put it there to help its ability to cool itself.

NOTE:

The compressors that these types of relays provide power for are power hungry. In other words, they are the biggest of the Ford/Lincoln group and "draw" or "pull" allot of amps even when brand new. This same compressor with some time on the clock can eat a relay for lunch!

It is located in the RF fenderwell up high, like behind the headlight housing. It is (see pic above) black & aluminum in color with cooling fins. First unplug the connector and inspect the contacts. Even if it "looks" clean, while your in there, go ahead and clean the contacts with an eraser and wash any contaminates(grease/oils) away with electrical contact cleaner and put some dielectric grease on the contacts. Blow dry with compressed air if you have access to an air compressor.

I have had several and heard of many more that had no signs of corrosion, but came back to life after 10-15 minutes of TLC.

PARTS - AIR SUSPENSION HELP