Low Air light in Tell-Tale Panel

al chernoff

New member
Oct 11, 1999
737
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Emery... count me in on one of the connectors. I want to connect up the light
to tell me when the compressor goes on.
thanks.

> Starting in 1976 GMC discontinued the use of the Low Air indicator in the
> Tell Tale panel. It is the third lightbulb from the left, between the Door
> and the Parking Brake indicators. Duane Simmons has suggested that it be
> used to tell when the suspension air compressor is on. I just did this and
> found it quite easy to do.
>
> 1. You'll need the special connector that snaps into the plug that connects
> to the tell tale printed circuit. GM left the bulb there but did not put in
> the connector. This goes in the blank position in the top of the connector.
> When this lead is grounded, the Low Air bulb will light up.
>
> 2. Run a wire from the back of the dash to the air compressor compartment.
> Connect the wire behind the dash to the special connector and in the air
> compressor compartment connect it to one of the two unused screws in the
> pressure switch. I have a Penn switch. The two existing wires control the
> compressor motor. The other two screws are the ones to use for the Low Air
> light.
>
> 3. Run another wire from the second unused screw to a good ground.
>
> Now, whenever the compressor comes on the pressure switch will ground the Low
> Air light and it will light in the dash. This is especially good for anyone
> who is starting to have a little trouble hearing the compressor when driving
> down the road (like me).
>
> I have an extra two of the special connectors that are needed. If anyone
> wants one of them please let me know. First come, first served. They can be
> found on connectors for some of the Olds, Cadillac and Buick instrument
> panels in the junkyard.
>
> Emery Stora
> 77 Kingsley
> Santa Fe, NM
 
For a long time I have heard that the existing wiring for the air
compressor
that is located in the cabinet across from the bathroom should be
modified.
The positive (hot) lead is a 12 gauge wire that runs all the way back
from
the ignition key switch.

> Starting in 1976 GMC discontinued the use of the Low Air indicator in
the
> Tell Tale panel. It is the third lightbulb from the left, between the
Door
> and the Parking Brake indicators. Duane Simmons has suggested that it
be
> used to tell when the suspension air compressor is on. I just did
this and
> found it quite easy to do.
>
> 1. You'll need the special connector that snaps into the plug that
connects
> to the tell tale printed circuit. GM left the bulb there but did not
put in
> the connector. This goes in the blank position in the top of the
connector.
> When this lead is grounded, the Low Air bulb will light up.
>
> 2. Run a wire from the back of the dash to the air compressor
compartment.
> Connect the wire behind the dash to the special connector and in the
air
> compressor compartment connect it to one of the two unused screws in
the
> pressure switch. I have a Penn switch. The two existing wires
control the
> compressor motor. The other two screws are the ones to use for the
Low Air
> light.
>
> 3. Run another wire from the second unused screw to a good ground.
>
> Now, whenever the compressor comes on the pressure switch will ground
the Low
> Air light and it will light in the dash. This is especially good for
anyone
> who is starting to have a little trouble hearing the compressor when
driving
> down the road (like me).


- --------------------------------------------------------------------------------------------------------

If you go to my web site, particularly page 11,
( http://meltingpot.fortunecity.com/greenside/321/page11.html ), you
will see the
details for rewiring the air compressor when it is mounted in the rear
cabinet. I
suggest installing a new lamp in the compressor control panel rather
than hunt
for a connector. This schematic was posted months ago. As stated, there
is a
tremendous voltage drop as originally wired.

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