ac wire for dc fan control?

tim281

New Member

Dec 18, 2005

125

1

0

Portland, OR

Apr 7, 2009

#1

• Apr 7, 2009

• #1

looking at the info on the tmoss wire diagrahm located here: http://http://www.veryuseful.com/mustang/tech/engine/images/91-93_5.0_EEC_Wiring_Diagram.gif

would i hook the dc controler a/c wire up to the blk/yel wire?

i have a dc control FK-50P and was trying to figure out where to hook up the auxiliary ac input...all the instructions say is "If the vehicle has air conditioning and originally came with a mechanical fan, connect the blue AC input wire of the harness to the air conditioning compressor input."

can someone tell me where to hook this wire up and what color it is? i am guessing just splice in at the wire harness feeding to the ac compressor, but what wire color?
thanks!

 

Blandnuts

I don't swallow; I only swoosh

Founding Member

Aug 21, 2000

1,172

124

124

FloorDuh

Apr 7, 2009

#2

• Apr 7, 2009

• #2

I'm pretty sure it's the yellow black wire. I could verify that tomorrow if no one else can verify it by then (it's past my bed time ).


edit: I spliced mine about 4 inches from the compressor.

 

tim281

New Member

Dec 18, 2005

125

1

0

Portland, OR

Apr 7, 2009

#3

• Apr 7, 2009

• #3

Thanks. I think it must be the blk/yel wire, I saw it listed in some more of the tmoss schematics....

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Apr 8, 2009

#4

• Apr 8, 2009

• #4

To decrease the chance of cyclic action, I would tap into the AC feed into the LPCS (green/purple on earlier aero foxes IIRC). This wire is hot anytime the AC is on, not just when the clutch is engaged.

 

67coupe

Founding Member

Apr 5, 2002

658

402

93

Huntsville, AL

Apr 8, 2009

#5

• Apr 8, 2009

• #5

If you don't have an answer by this afternoon. I can look at mine after work and let you know.

 

tim281

New Member

Dec 18, 2005

125

1

0

Portland, OR

Apr 9, 2009

#6

• Apr 9, 2009

• #6

tap into the AC feed into the LPCS (green/purple on earlier aero foxes IIRC).

Click to expand...

I am not famaliar enough with fox body electronics to exactly know what you are talking about? Can you please explain the to me what the LPCS & IIRC is?
Thanks!

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Apr 9, 2009

#7

• Apr 9, 2009

• #7

tim281 said:

I am not famaliar enough with fox body electronics to exactly know what you are talking about? Can you please explain the to me what the LPCS & IIRC is?
Thanks!

Click to expand...

LPCS: Low Pressure Cycle switch. It's the 3 wire switch on top of the accumulator (the cylinder looking part of the AC system on the passenger firewall). The wire you want will show constant 12 V at the LPCS whenever the AC is on (the other wires will lose 12V as the AC Clutch disengages at idle.

IIRC = If I Remember Correctly.

 

Blandnuts

I don't swallow; I only swoosh

Founding Member

Aug 21, 2000

1,172

124

124

FloorDuh

Apr 9, 2009

#8

• Apr 9, 2009

• #8

Yikes, didn't follow up. I'd do what Hissin says...he sometimes gives good info

 

tim281

New Member

Dec 18, 2005

125

1

0

Portland, OR

Apr 9, 2009

#9

• Apr 9, 2009

• #9

Great information, I will go lpcs route when I do the install. BTW, any good tips or tricks for quick and clean ways to probe the wires through the connector. Seems like a sewing needle through the weatherpacking might be best?

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Apr 9, 2009

#10

• Apr 9, 2009

• #10

tim281 said:

Great information, I will go lpcs route when I do the install. BTW, any good tips or tricks for quick and clean ways to probe the wires through the connector. Seems like a sewing needle through the weatherpacking might be best?

Click to expand...

If you disconnect the connector, turn the key on (might have to start it - I'm not sure) and turn the AC on, one wire should have 12V. The rest will not. That's the wire you want.

Or if you have a green/purple wire, chances are that's the one you want so stick it with a safety pin where you'd splice into it anyways. Chances are it's the correct wire and you'll be removing more insulation anyhow. I dont like to shove anything into gooey weathertight connectors.