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A/C Amplifier Pin #7

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Old 08-12-2017, 07:28 PM   #1
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A/C Amplifier Pin #7

Just installed a new A/C amplifier, A/C Compressor, Receiver/dryer. Pin #7 is the pin that is supposed to send 12V+ to the A/C compressor clutch to engage it. The wire going from Pin #7 behind the dash has been traced and has resistance as well as continuity. Is there something else from maybe a sensor that is causing the amplifier to not send power to the A/C compressor clutch??? I have a back up New A/C Amplifier I will try tomorrow to see if the New one I installed was defective. Also we put a jumper from the Positive post on the battery to the A/C compressor just to test the compressor and it all works. We are just trying to get it to all work normally from the Controls to the A/C Amplifier to the A/C Compressor. Thanks, Picture/diagram below.

Last edited by yngbuck19; 08-12-2017 at 08:01 PM. Reason: Inserting picture
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Old 08-13-2017, 01:06 AM   #2
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What do the Manifold gauges read ??

All the criteria needs to meet before the AC amplifier will engage the clutch

Pressure to high or to Low will keep the clutch from getting voltage .

It could be poor connections

Failed sensors

bad switch

something not hooked up

Just what are you working on?

You have to look at the complete AC circuit diagram to figure why things are not working
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Old 08-13-2017, 08:34 PM   #3
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Quote:
Originally Posted by wyoming9 View Post
What do the Manifold gauges read ??

All the criteria needs to meet before the AC amplifier will engage the clutch

Pressure to high or to Low will keep the clutch from getting voltage .

It could be poor connections

Failed sensors

bad switch

something not hooked up

Just what are you working on?

You have to look at the complete AC circuit diagram to figure why things are not working
Very correct. There are fail safe's in place to keep the compressor from running dry and without a charge as the r-12 or r-134 lubricates the pump and keeps the pump from staying of and freezing. If you are auto, there is also a temp sensor the kicks a/c off to keep engine from overheating and or transmission from overheating.
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Old 08-14-2017, 06:00 AM   #4
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This should help: http://web.archive.org/web/201204270...ditioning.html

Note that pin 6 is the ignition pulse (the compressor won't engage with the engine not running). It's just a pulse, so it is possible that your voltmeter would only show 0v at idle. You need that pulse, as well as the appropriate signal from the thermistor and the pressure switch.
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Old 08-15-2017, 01:50 PM   #5
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I see so many try and test things on a new install without charging the system.

Then wonder why it does not turn the dry compressor on
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