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#21
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OK done some reverse engineering the coil of the relay has a switched controlled ground and a 12v power supply controlled through ignition sw I guessing as the 12v is not constant the common contact on the relay has a constant 12v. for the clutch solenoid to energize with ignition off, a ground would have to be supplied to the relay and also a power source to energize the relay. So theoretically if the ignition switch was not shutting off all the way when key is extracted and the control was left on defrost this would cause the problem as I had described. Not sure were the low pressure sw. plays in this theory though, is it ignition controlled? But I recall the solenoid engaging with the heater in off selection I'm pretty sure. If the PCM was having a melt down you think I would notice more symptoms on other systems. Ok I think I just talked myself out of understanding what the hell is going on. x1=12v sw x2= gnd sw C= common 12v constant nc= normally closed to common no= normally open or closed to common when relay is energized | or __ = contacts -- | x2 | nc | x1 __no __C |
#22
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OK done some reverse engineering |
#23
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Your use of the word common confuses me, as it is the term we use for the white wire in out homes which is grounded, just like the bare copper wire is. God Bless America, ßill O|||||||O mailto:LWHughes3rd (AT) aol (DOT) com http://www.billhughes.com/ JEEPR wrote: OK done some reverse engineering the coil of the relay has a switched controlled ground and a 12v power supply controlled through ignition sw I guessing as the 12v is not constant the common contact on the relay has a constant 12v. for the clutch solenoid to energize with ignition off, a ground would have to be supplied to the relay and also a power source to energize the relay. So theoretically if the ignition switch was not shutting off all the way when key is extracted and the control was left on defrost this would cause the problem as I had described. Not sure were the low pressure sw. plays in this theory though, is it ignition controlled? But I recall the solenoid engaging with the heater in off selection I'm pretty sure. If the PCM was having a melt down you think I would notice more symptoms on other systems. Ok I think I just talked myself out of understanding what the hell is going on. x1=12v sw x2= gnd sw C= common 12v constant nc= normally closed to common no= normally open or closed to common when relay is energized | or __ = contacts -- | x2 | nc | x1 __no __C |
#24
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JEEPR did pass the time by typing: OK done some reverse engineering Did you read the schematic I posted a link to? The relay is supplied 12V from the battery through a fuse to the relay coil. The relay coil then gets it's ground through the computer. That clicks the relay. The 12V supply to the clutch runs across the high and low pressure safety switches to the relay (switch side) and then to the clutch. Your basic relay: http://www.revbeergoggles.com/temp/relay.jpg Your basic relays schematic: http://www.revbeergoggles.com/temp/relay-diagram.jpg -- DougW |
#25
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take a look at Doug's schematic at http://www.revbeergoggles.com/temp/relay-diagram.jpg 30 being the common terminal, 87a being normally closed and 87 being normally open, that how we phrase it in the aviation industry -- Matt 0|||||||0 Tact is the ability to describe others as they see themselves "L.W. (ßill) Hughes III" <billhughes (AT) cox (DOT) net> wrote in message news:42813B52.8D1FE10 (AT) cox (DOT) net... Your use of the word common confuses me, as it is the term we use for the white wire in out homes which is grounded, just like the bare copper wire is. God Bless America, ßill O|||||||O mailto:LWHughes3rd (AT) aol (DOT) com http://www.billhughes.com/ JEEPR wrote: OK done some reverse engineering the coil of the relay has a switched controlled ground and a 12v power supply controlled through ignition sw I guessing as the 12v is not constant the common contact on the relay has a constant 12v. for the clutch solenoid to energize with ignition off, a ground would have to be supplied to the relay and also a power source to energize the relay. So theoretically if the ignition switch was not shutting off all the way when key is extracted and the control was left on defrost this would cause the problem as I had described. Not sure were the low pressure sw. plays in this theory though, is it ignition controlled? But I recall the solenoid engaging with the heater in off selection I'm pretty sure. If the PCM was having a melt down you think I would notice more symptoms on other systems. Ok I think I just talked myself out of understanding what the hell is going on. x1=12v sw x2= gnd sw C= common 12v constant nc= normally closed to common no= normally open or closed to common when relay is energized | or __ = contacts -- | x2 | nc | x1 __no __C |
#26
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| But I recall the solenoid engaging with the heater in off selection I'm pretty sure. |
#27
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OK, but we use terms like ground or power to identify the wires like in this basic KC relay wiring: http://www.kchilites.com/instruction...layHarness.pdf Like nothing says "common" in these diagrams: http://www.billhughes.com/ACWire.pdf God Bless America, ßill O|||||||O mailto:LWHughes3rd (AT) aol (DOT) com JEEPR wrote: take a look at Doug's schematic at http://www.revbeergoggles.com/temp/relay-diagram.jpg 30 being the common terminal, 87a being normally closed and 87 being normally open, that how we phrase it in the aviation industry -- Matt 0|||||||0 Tact is the ability to describe others as they see themselves "L.W. (ßill) Hughes III" <billhughes (AT) cox (DOT) net> wrote in message news:42813B52.8D1FE10 (AT) cox (DOT) net... Your use of the word common confuses me, as it is the term we use for the white wire in out homes which is grounded, just like the bare copper wire is. God Bless America, ßill O|||||||O mailto:LWHughes3rd (AT) aol (DOT) com http://www.billhughes.com/ JEEPR wrote: OK done some reverse engineering the coil of the relay has a switched controlled ground and a 12v power supply controlled through ignition sw I guessing as the 12v is not constant the common contact on the relay has a constant 12v. for the clutch solenoid to energize with ignition off, a ground would have to be supplied to the relay and also a power source to energize the relay. So theoretically if the ignition switch was not shutting off all the way when key is extracted and the control was left on defrost this would cause the problem as I had described. Not sure were the low pressure sw. plays in this theory though, is it ignition controlled? But I recall the solenoid engaging with the heater in off selection I'm pretty sure. If the PCM was having a melt down you think I would notice more symptoms on other systems. Ok I think I just talked myself out of understanding what the hell is going on. x1=12v sw x2= gnd sw C= common 12v constant nc= normally closed to common no= normally open or closed to common when relay is energized | or __ = contacts -- | x2 | nc | x1 __no __C |
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