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A/C CLUTCH SOLENOID

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  #21  
Old   
L.W.(ßill) Hughes III
 
Posts: n/a

Default Re: A/C CLUTCH SOLENOID - 05-10-2005 , 06:53 PM






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:
Quote:
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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  #22  
Old   
DougW
 
Posts: n/a

Default Re: A/C CLUTCH SOLENOID - 05-10-2005 , 07:19 PM






JEEPR did pass the time by typing:
Quote:
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





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  #23  
Old   
JEEPR
 
Posts: n/a

Default Re: A/C CLUTCH SOLENOID - 05-10-2005 , 08:04 PM



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

Quote:
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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  #24  
Old   
JEEPR
 
Posts: n/a

Default Re: A/C CLUTCH SOLENOID - 05-10-2005 , 08:07 PM



I did
Just trying to figure out how the solenoid energizes when the key is
removed.

--

Matt
0|||||||0
Tact is the ability to describe others as they see themselves
"DougW" <post.replies (AT) invalid (DOT) address> wrote

Quote:
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






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  #25  
Old   
L.W.(ßill) Hughes III
 
Posts: n/a

Default Re: A/C CLUTCH SOLENOID - 05-10-2005 , 08:44 PM



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:
Quote:
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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  #26  
Old   
Mike Romain
 
Posts: n/a

Default Re: A/C CLUTCH SOLENOID - 05-11-2005 , 01:39 PM



JEEPR wrote:
Quote:

But I recall the solenoid engaging with the heater in off selection I'm
pretty sure.

You really should make sure one way or the other.

Do you already have a rotted ground strap from the rear of the engine
head to the firewall? If this ground is bad, you also will get a dead
battery. Seeing as you post from sympatico, you are in the rust belt
and that strap does rot out. There is another computer harness ground
on a bolt at the rear passenger side of the engine with a mess of small
wires on it.

If the computer is seeking a ground for it's 'holding' power, it could
maybe be stealing it through that relay which keeps the thing activated.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's


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  #27  
Old   
JEEPR
 
Posts: n/a

Default Re: A/C CLUTCH SOLENOID - 05-11-2005 , 03:45 PM



Sorry bill didn't have a diagram at the time and like I said I was use to
aviation terms
in the light diagram you mention it is only a two contact relay
the 85 terminal we cal X1 indicated vdc applied to the coil, terminal 85 we
would call that X2 indicated the grounded side of the coil, terminals 30
and 87 would be the contacts.

In the air conditioning schematic look at C100, a multicontact relay
B8 = X1, B10 = X2, B6 would be the common contact, B9 would be the normally
closed contact and B7 would be the normally open contact.
That's how we would describe it, just so when you refer to relays in
discussion it is a standard and leads to no confusion. just a little trivia
or info, funny the differences between the three industries,
household,automotive and aviation

--

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

Quote:
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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