Do you have a 1977-1978 Supplemental Manual? There is a troubleshooting
guide there that might prove helpful to you. The switches activate relays
that in turn power the compressor motors. I would check for continuity to
the relays to the low side as well as the lowering relay to the high side.
Most of the EL II problems can be traced back to poor continuity in the
connectors at either the ride height sensors in the wheel wells and those
in the wire harness in the compressor compartment. Look for signs of
corrosion and rodents chewing on the wires.
Jim Hupy
Salem, OR
78 GMC Royale 403

On Tue, May 5, 2015 at 4:28 PM, John Fredrikson wrote:

> Driving my coach today it felt like it was not level. I was driving with
> the Electrolevel II in travel mode. I pulled off the road and switched to
> hold and set both sides to down. The left lowered, but the right never
> did. Switching to raise on both sides, the left wouldn't pump and the right
> pump would pump. I tried each several times with the same results. Now the
> right side is higher than it should be and the left side is almost all the
> way down.
>
> I tried cleaning the contacts at the switches, but no luck.
>
> Any recomendations on troubleshooting?
>
> Thanks for your help.
>
> John
> Fayetteville, GA
> 1978 Eleganza
> --
> John Fredrikson
> Fayetteville, GA
> 1978 Eleganza
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Try this information on Electro-level.

http://www.bdub.net/manuals/Electro-Level.pdf


JR Wright
78 Buskirk Stretch
75 Avion
Michigan

> On May 5, 2015, at 7:58 PM, James Hupy wrote:
>
> Do you have a 1977-1978 Supplemental Manual? There is a troubleshooting
> guide there that might prove helpful to you. The switches activate relays
> that in turn power the compressor motors. I would check for continuity to
> the relays to the low side as well as the lowering relay to the high side.
> Most of the EL II problems can be traced back to poor continuity in the
> connectors at either the ride height sensors in the wheel wells and those
> in the wire harness in the compressor compartment. Look for signs of
> corrosion and rodents chewing on the wires.
> Jim Hupy
> Salem, OR
> 78 GMC Royale 403
>
> On Tue, May 5, 2015 at 4:28 PM, John Fredrikson wrote:
>
>> Driving my coach today it felt like it was not level. I was driving with
>> the Electrolevel II in travel mode. I pulled off the road and switched to
>> hold and set both sides to down. The left lowered, but the right never
>> did. Switching to raise on both sides, the left wouldn't pump and the right
>> pump would pump. I tried each several times with the same results. Now the
>> right side is higher than it should be and the left side is almost all the
>> way down.
>>
>> I tried cleaning the contacts at the switches, but no luck.
>>
>> Any recomendations on troubleshooting?
>>
>> Thanks for your help.
>>
>> John
>> Fayetteville, GA
>> 1978 Eleganza
>> --
>> John Fredrikson
>> Fayetteville, GA
>> 1978 Eleganza
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

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I will study as well. The EL 2 in my 78 Royale all works, EXCEPT when in travel mode the right side deflates and releases all of the air and leaves me sagging. It will pump back up and hold air in the hold mode but not in travel.

Are you SURE the switches you cleaned are good by confirming with an Ohm meter??I had one I was sure would be good after opening and cleaning but NO. A tiny piece if the protective foam sheet had turned to a goo ball smaller than a pin head and was keeping the points from contacting.

Steve wrote on Tue, 05 May 2015 19:47

I will study as well. The EL 2 in my 78 Royale all works, EXCEPT when in travel mode the right side deflates and releases all of the air and leaves me sagging. It will pump back up and hold air in the hold mode but not in travel.

I suspect you have a leak in the small nylon line that runs between the hold solenoid and the compressor for the appropriate side.

John, The switches and sensors control the negative side of the air and compressor solenoids. The right side dump valve is not exhausting air. Since the right side does pump up the 'hold' solenoid is performing as designed. Use a test light to see if you have 12v across the leads to the dump solenoid (which is located in the head of the right side compressor) when lowering switch is activated. There should be. If there is, hopefully there is just a bad connection.

As far as the left side is concerned, check to see if the compressor solenoid is sending 12V + to the compressor motor. Hopefully it's just a bad connection there, also.

Need more help just give me a call at 7l34I636for7

I spoke too soon. I lifted the rear of the coach this afternoon to test the macerator and couldn't lower the the left side when I was done. When I hit the lower switch on the left side, I hear a click, but I don't hear the his of releasing air and the gauge doesn't move.

I checked the connections in the cabinet and they all seem OK. Could it be an issue with the sensor in the wheel well? I have a spare that came with the coach, would it be worthwhile replacing it?

Thanks,

John