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Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

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Old 10-22-2008, 07:01 AM   #1
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A/C compressor connector w/ resistor. . . Why?

Hows it going? I'm in the process of replacing the engine harness in my '89 GTA (with the correct one this time lol ) but before I do, replace the dirty brittle factory convoluted tubing that protects the wires as well which I'm doing so at the momnt. Today as I was doing what appears to be the a/c compressor wiring, I noticed it had a few layers of dry brittle electrical tape wrapped around the connector were the wires go into it. I decided to unwrap it and found a small resistor plugged into both terminals of the connector. Anyone know why it was placed there? Heres some pics of what I'm talking about:

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Thanks in advance for the info!

Later,
Phoenix
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Old 10-22-2008, 07:31 AM   #2
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Re: A/C compressor connector w/ resistor. . . Why?

I believe it is a diode.

When you shut off a soenoid the magnetic field collapses and creats a pulse of current that can go back up the wires. If the compressor is attatched to something sensitive, say the ecm, it can fry things. The diode is there to bleed off the inductive pulse when the solenoid disengages.
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Old 10-22-2008, 09:24 AM   #3
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Re: A/C compressor connector w/ resistor. . . Why?

Toehead is right, it's the flyback diode that prevents the inductive spike from traveling up the wires to the ECM.
Leave it in there if you want to keep your ECM from burning up.

Lou
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Old 10-24-2008, 10:42 AM   #4
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Re: A/C compressor connector w/ resistor. . . Why?

So the diode (not resistor) must be in there from the factory then correct? Since it was wrapped up in dry electrical tape and looked somewhat 'bootlegged', I thought someone might of put it in there due to an electrical problem they had or something. IMO, the connector and wires look like they need replacing so I'll look into tpiparts.net for a new one and wire it in b/c not even my old harness' a/c connector looked this bad lol. I'll definately leave it in for now since frying my new (rebuilt) ecm isn't an option. Thanks again guys.

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Phoenix
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Old 10-24-2008, 03:53 PM   #5
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Re: A/C compressor connector w/ resistor. . . Why?

I forgot to ask. Anyone know the part # to a new a/c pigtal connector like the one pictured? Thanks in advance.

Phoenix
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Old 11-03-2008, 05:23 PM   #6
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Re: A/C compressor connector w/ resistor. . . Why?

I picked up a good used connector at the junk yard today and wired it into the harness. All systems go .

L8R,

Phoenix
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Old 11-03-2008, 05:23 PM
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