Author Topic: '72 340 with A/C question  (Read 1341 times)

Offline joelson6

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'72 340 with A/C question
« on: July 26, 2016 - 08:12:04 PM »
 I'm looking for the thermoquad Carburetor Solenoid Wiring Harness for a '72 Challenger with a 340 and A/C. whenever i run the A/C the idle drops almost to the point of stalling. I have the Solenoid and it does work. I just don't have the wiring harness to connect it to the A/C circuit. I can't even seem to find the wiring diagram for this either. looked in my '72 shop manual, looked in a '72 parts catalog, can't seem to find anything about it.




Offline Bullitt-

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Re: '72 340 with A/C question
« Reply #1 on: July 26, 2016 - 11:04:45 PM »
Not an A/C car but on my '73 the idle solenoid was hard wired to the solenoid & plugged in between the alternator's blue wire.
Activation was based on power going to the alternator..
Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
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Offline joelson6

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Re: '72 340 with A/C question
« Reply #2 on: July 30, 2016 - 12:57:29 AM »
thanks, but that's doesn't help me because i need the activation when the A/C is turned on and not when the car is running.

Offline 1 Wild R/T

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Re: '72 340 with A/C question
« Reply #3 on: July 30, 2016 - 01:24:57 AM »
Chrysler didn't use the idle solenoid for A/C, they hooked it to the field wire on the alternator, but it would be easy to retask it by Teeing into the A/C clutch signal.. But realize the solenoid won't be strong enough to open the throttle.. It will hold the throttle open once it's been opened & closes to the point where the idle screw contacts the solenoid plunger but till you blip the throttle it will still remain at the base idle....
JS27N0B 70 Challenger R/T Convertible  FJ5 Sublime, Show Poodle w/90,000 miles since resto
WS27L8G 68 Coronet R/T Convertible  PP1 Bright Red, Project
RM21H9E 69 Road Runner Coupe R4 Performance Red, Sold...
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Offline joelson6

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Re: '72 340 with A/C question
« Reply #4 on: July 30, 2016 - 09:10:25 PM »
thanks, i do realize that you have to hit the throttle to get the solenoid to stay out. read that in the shop manual. i guess i'm making a harness but i need to find the factory connectors.

Offline 1 Wild R/T

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Re: '72 340 with A/C question
« Reply #5 on: July 30, 2016 - 10:22:34 PM »
Might contact Jim Slott, (JS Restorations) he could build you a harness easily that very few would suspect wasn't OE..
JS27N0B 70 Challenger R/T Convertible  FJ5 Sublime, Show Poodle w/90,000 miles since resto
WS27L8G 68 Coronet R/T Convertible  PP1 Bright Red, Project
RM21H9E 69 Road Runner Coupe R4 Performance Red, Sold...
5H21C  65 Falcon 2 dr Wagon... Dog Hauler...