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Unread 08-16-2011, 06:16 AM   #46
JBTJ
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Quote:
Originally Posted by tapenick View Post
Couldn't the hot wire that is currently supplying the switch be used to power the relays?
Yes it could, but then you will be using a circuit that was not designed for that. Meaning that the wire is already undersized as it is and adding an additional load to that circuit could cause it to fail. Then you would be back in the same boat, so to speak. Best is to run the hot wire fused straight to the battery.

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Unread 11-19-2011, 08:01 PM   #47
tapenick
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Latest - the compressor is running all the time. Even when the mode selector is on vent or heat. I'm guessing that the compressor switch on the mode selector switch is shorted ... don't really want to buy a new mode selector switch just for that.. thinking about putting a toggle switch in. Thoughts?
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Unread 11-19-2011, 08:19 PM   #48
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Originally Posted by tapenick View Post
Latest - the compressor is running all the time. Even when the mode selector is on vent or heat. I'm guessing that the compressor switch on the mode selector switch is shorted ... don't really want to buy a new mode selector switch just for that.. thinking about putting a toggle switch in. Thoughts?
It's been done before. I think Knucklehead did it so he could run the defroster without the compressor running.
Did you do the relay mod?
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Unread 11-20-2011, 07:17 AM   #49
tapenick
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I have a relay on high speed... going to do med-hi next. If I remember correctly there are three wires on that switch... guess I need to dig the schematic back up to see which to use.
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Unread 11-25-2012, 05:01 PM   #50
tapenick
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Update -
Looks like the electrical part of the Mode Selector switch is shorted out. Looking at the schematics, the light green wire goes to the A/C select in the Control Module. I disconnected it and the compressor stopped running. Now I just need to add a switch so I can make it run when I want / need it to!

Attaching a pic in case someone is chasing the same issue later... can barely see the red oval I made around the A/C control connector on the right. On that connector there's a black wire in the bottom position that provides constant ground (basically for the entire HVAC control system), dark green wire in the middle (red in my pic) that provides switched ground to the controls (e.g. fan doesn't run if the Mode Selector is in the Off position), and light green in the top position (white in my pic) that goes to the A/C select as stated above. Sorry about the wire color confusion, I had to chop out wire w/ melted insulation and used different colors.

One step closer. Still only have high speed working and some sort of ground feedback issue causing the relay to not shut off when the resistor is connected. Next step is probably going to be to run new wire from the fan switch to the relay as I suspect the wires are shorted.


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