A/C Amplifier Signal Problem

[Stickboy]

So here's my issue,
I'm putting a 13bt into my fj60 and at that point where I want to hook up the A/C. The option i'm hoping will work is to use the 24V compressor on the 13bt and feed a signal to it to throw the magnetic clutch with the push button stock A/C electronics of my 86 Fj60.

The issue is that the amplifier in the fj60 wants a signal from the igniter telling it the motor is running. I was told that you could turn the RPM's down on the amp and it'd bypass that feature but I don't think it's working. I put my voltmeter on the lead heading to the compressor and am looking for 12v (is that what I'm looking for?). I get between 12-132mV depending where the amp is on the dial. I'm guessing the proper signal isn't getting to the amp from the igniter.

Can someone help me with what I should be expecting to get for a signal at the lead to the clutch.

Here's my idea of the amp won't work. Build a tone generator that'll simulate the signal from the amplifier when the ignition is on and trick it to thinking I'm a gasser.....

thanks a bunch,
mike

 

[60wag]

I don't know much about diesels but something is there to make the tachometer work. (Crank angle sensor?) You might be able to "barrow" the tach signal to drive the AC amp.

 

[cruiser_guy]

Mike, keep me up to date on your progress with the A/C. I'll be doing similar with the FJ55. I have the FJ55 A/C manual but I haven't decided if I should "create" my own A/C amplifier or "fool" the one I have here.
If you get desparate let me know and I'll get a part number from my BJ60. It would be a 12v unit.

 

[dd113]

Lost here. 24V compressor will need, I assume, 24V to kick in the clutch. If it will kick in on 12V try hot jumping it direct from the batt. to make sure it works. If the system is not full it will not kick on due to the low pressure switch.