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1987_345 · 02-19-2011, 06:31 AM

Well I've tried tagging onto a couple of other threads to try and find this thing, but been unsuccessful so far. Thought I would try a thread of my own. I have a 1987 345 and am looking for the electric relay that powers the rear bag air compressor. I've attached this page out of my manual that shows what I'm looking for and where to find it....It's just not there!!! Help

cooperhawk · 02-19-2011, 06:46 AM

Mine is located under the curb side vanity in the bedroom and is not accessible unless I take out portions of the vanity. We have the single queen size bed. If you have another set up it may not be there.

raveson · 02-19-2011, 07:21 AM

My isolaters are located on the outside rear of the battery tray. There are two, one for the chassie and one for the coach. Note, if the one for the chassie fails, you can not start the engine. Have replaced both after the coach one failed. I kept the one that worked for emergency if needed. These isolaters are controlled by the two kill switches to the front of the entrance door on the wall.

steveturk · 02-19-2011, 08:39 AM

On my 1983 310 there is a relay switch ( or something electrical ) in the left side rear compartment where the power cord is. If I remember right there is also an air line going to it. I'll try to see where the wiring leads to. It appears my compressor was removed by the previous owner...haven't been able to find it.

345bill · 02-19-2011, 10:48 AM

My 1990 345LE has twin beds, the compressor and relay are located towards the back under the curb side bed on mine.

1987_345 · 02-20-2011, 12:08 PM

Thanks guys. This is amazing. All of you report different locations. I just got back into town and intend to check out all additional possibilities. Thank-you very much. I will report back with what I find. Also the PO of my coach was very diligent in giving me all they had regarding documentation that came with the coach when they bought it new, so I have the original sales brochure and the Silver Series owners handbook. If I can ever help you with a problem, please don't hesitate to ask. Thanks again, Kenneth

jking · 02-20-2011, 12:15 PM

My 84 310 agrees with steveturk - the pressure switch relay is located in the rear roadside compartment right on top of the compressor. It has both electrical and air line connections so it can respond to low pressure, and it is owner-adjustable so you canb set it for varying load conditions. Good luck with yours.
Jamie

AirRowan · 02-20-2011, 05:14 PM

I am back now and did a good search and think it must be in the dash some were. I followed the wires from the isolator to the fire wall and that is what it looks like to me.
You are not looking for the presser relay you are looking for the bus relay right?
Please let me know what you find out. I will have the front end off of mine latter this week and it might show it self.
Josh

1987_345 · 02-21-2011, 07:38 AM

Well, I finally solved the mystery. Just because the manual sheet shows things one way doesn't mean that is actually how it was built!! As it turns out, 3 of the circuit breakers were mounted on the coach frame just to the right of the isolater, the breaker for the step is mounted on the chassis frame behind the batteries, and the compressor breaker along with one other breaker was placed with the automotive fuses which are accessed in the glove compartment. Now to make matters more complicated, they had vibrated loose and fallen out landing not in the glove box but under it. I didn't even figure it out until I took the glove box out and saw them laying there. I then had to figure out which slots they plugged into because they are UNMARKED!!! Everything is fixed now and almost back together. Thank-you so much all of you who posted back to me on this issue. I was about to pull my hair out!! Thanks again. Safe travels...Kenneth