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Registered
Join Date: Mar 2003
Location: Naples,FL
Posts: 3,469
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No power to A/C switch
My A/C compressor stop turning on. Its notrecieving any power so I checked the switch on the dash. No power. So I checked the fuse and It was fine. Can anyone tell me where the wire from the swicth goes? It runs thru the fire wall and then I lose it.
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08-11-2003, 06:17 AM
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Heck, I’m only 5 not 71!
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This is from the shop manual schematic for the 76 A/C. Power comes from fuse S20 and goes to AC relay pin 30. From pin 30 to pin 87. pin 87 on AC relay goes to the 3 speed Fan switch and the thermostat control. 3 speed Fan switch supplys power to evaporator motor, Electromagnetic clutch on Compressor and relay for condensor fan. The AC relay coil pin 86 gets its power from ignition switch terminal 15. The AC relay coil pin 85 goes to ground. Hope this helps. Check fuse panel and smugglers box for AC relay location.
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Pat Henry Targa80 1980SC Targa (Mocha Brown) |
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08-11-2003, 07:07 AM
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Registered
Join Date: Mar 2003
Location: Naples,FL
Posts: 3,469
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So I checked the relay again and its fine. Odd though, 87 on mine is the Horn. I'm not sure which one is for the A/C but they were all getting power so it doesn't matter. Fuses check out fine. Is there and inline fuse or a switch loctaed behind/in the blower motor that could have died?
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08-12-2003, 04:50 AM
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Heck, I’m only 5 not 71!
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Each relay has at least four contacts pins. Pin 86 & 85 are for the coil, Pin 30 & 87 are for the normally open switch contacts. When the coil is energized the normally open contacts close. I don't know what you mean by the 87 contact is for the horn unless you are looking at the relay for the horn? There are no inline fuses for the AC circuit other than what is on the fuse block. Do you know which relay is for your A/C? Just looked at the drawing showing the Fuse panel and it indicates the first relay looking from the front of car is for the A/C. S20 is the fuse for the A/C, Fuse S1 is the first fuse looking at the fuse block from the front of the car. This may be obvious to you but I will mention it just in case. The car must be running to check voltages on the circuit. Troubleshooting by checking for opens wires with an ohm meter can be done with the car off and battery voltage removed. Good luck and let me know what you find. The horn relay should be the third relay looking at the fuse panel from the front.
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Pat Henry Targa80 1980SC Targa (Mocha Brown) Last edited by targa80; 08-12-2003 at 06:56 AM.. |
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08-12-2003, 06:49 AM
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