AC Diode... Which way to install?
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Instructor
Joined: Apr 2010
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From: MD
AC Diode... Which way to install?
When I bought my 89 the AC clutch wiring was cut and the diode was gone. I got a new diode and installed it and promptly blew the BCM. This time I'd like to do it the correct way. (LOL) Which way do I install the diode?? Thanks.
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
If you look at the diode, it has a ring/band marking on one end.
That end goes to the Black/White wire.
The other end goes to the Dark Green wire that you grounded while you were
testing to enable the clutch.
Here's the schematic. It shows the diode across the AC Clutch coil.
On my 89, not sure if the diode has ever been replaced but the diode is inside
a wiring harness and is not placed across the electrical plug that connects the
AC Clutch coil to the Clutch circuit.
That end goes to the Black/White wire.
The other end goes to the Dark Green wire that you grounded while you were
testing to enable the clutch.
Here's the schematic. It shows the diode across the AC Clutch coil.
On my 89, not sure if the diode has ever been replaced but the diode is inside
a wiring harness and is not placed across the electrical plug that connects the
AC Clutch coil to the Clutch circuit.
Last edited by Hooked on Vettes; Jul 6, 2010 at 11:52 AM.
Thread Starter
Instructor
Joined: Apr 2010
Posts: 114
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From: MD
This is what I bought for the car. I'm thinking about getting one from GM this time. How should I hook the second one up??
Had:
http://www.ecklers.com/corvette-air-...1963-1989.html
Getting:
http://www.repairconnector.com/produ...ith-Diode.html
I hooked the Ecklers one up with green to green and black to black/white with the connector at the AC clutch. Apparently that wasn't right.
Had:
http://www.ecklers.com/corvette-air-...1963-1989.html
Getting:
http://www.repairconnector.com/produ...ith-Diode.html
I hooked the Ecklers one up with green to green and black to black/white with the connector at the AC clutch. Apparently that wasn't right.
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
The Clutch Coil has two wires coming from it. It makes no difference which wire you
connect to them from the other half of the connector.
What matters is the diode must be connected properly to the connector with the Dark Green wire and the Black/White wire.
Inside that ivory colored plastic piece from Ecklers is the diode which you can't see.
Remove the original diode from the Ecklers harness and solder a new diode across the wires according to the info. I posted above.
If you had a ohm meter, you could easily verify if the Eckers diode is good or bad.
If you don't have a meter, go to Radio Shack and purchase a diode for .90 cents.
A 1N4004 diode will work as a replacement for the factory diode.
Here's the Radio Shack link.
http://www.radioshack.com/search/ind...kw=1n4004&sr=1
connect to them from the other half of the connector.
What matters is the diode must be connected properly to the connector with the Dark Green wire and the Black/White wire.
Inside that ivory colored plastic piece from Ecklers is the diode which you can't see.
Remove the original diode from the Ecklers harness and solder a new diode across the wires according to the info. I posted above.
If you had a ohm meter, you could easily verify if the Eckers diode is good or bad.
If you don't have a meter, go to Radio Shack and purchase a diode for .90 cents.
A 1N4004 diode will work as a replacement for the factory diode.
Here's the Radio Shack link.
http://www.radioshack.com/search/ind...kw=1n4004&sr=1
Last edited by Hooked on Vettes; Jul 6, 2010 at 03:15 PM.
Thread Starter
Instructor
Joined: Apr 2010
Posts: 114
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From: MD
Thanks a million Hooked!!! My diode flows every which way with the same resistance. I will go to Radio Shack and fix the Ecklers harness. Thank you for the info as I wasn't thinking of the diode going between green and Blk/Wht wires. I was thinking it was just inline on the green or black. Thanks again. 
