GMC Electro I diagnostics

[thom hole]

I have a problem with my '78 electro level I system. The passenger side
does NOT go up or down when set to 'AUTO', Drivers side responds as
expected. At first I thought it was the valve that opens up the line to
the bag, but the system works perfect when in 'HOLD' mode and using the
RAISE/LOWER manual switch. This makes me think that the valves are OK but
the rocker switch (DPDT) is not good when in AUTO setting. There is
something about a diode in the line from the switch to the valve. Could it
be bad?? Anyone with experiance like this??

 

[mr.c]

I posted some schematics on the web page that gene fisher has that has copies
of the way the circuits work in the up or down position. I found a problem
with one of the connectors in the back with the solenoids. It was getting
the 12v signal, but the copper connector had gone bye-bye. I put in a new
connector (just any two pin connector) and it started working fine. If you
want, go look at the schematics that show you what happens in each of the
positions of the switches.

If you need more, let me know.

Al

> I have a problem with my '78 electro level I system. The passenger side
> does NOT go up or down when set to 'AUTO', Drivers side responds as
> expected. At first I thought it was the valve that opens up the line to
> the bag, but the system works perfect when in 'HOLD' mode and using the
> RAISE/LOWER manual switch. This makes me think that the valves are OK but
> the rocker switch (DPDT) is not good when in AUTO setting. There is
> something about a diode in the line from the switch to the valve. Could it
> be bad?? Anyone with experiance like this??