Why is there a resistor here?
Thread Starter
Racer
Joined: Oct 2011
Posts: 417
Likes: 2
From: Blacksburg Virginia
Why is there a resistor here?
Below is a pic of my 84 ac compressor clutch.
Why is there a resistor or diode or whatever this is jammed in the back of my ac compressor connector?
The previous owner had the ac system disconnected. I put a new compressor in, and when I hooked it up I saw this on the back of the connector.
I have yet to get the rest of the system connected, so I don't know if it works yet.
Thanks
Why is there a resistor or diode or whatever this is jammed in the back of my ac compressor connector?
The previous owner had the ac system disconnected. I put a new compressor in, and when I hooked it up I saw this on the back of the connector.
I have yet to get the rest of the system connected, so I don't know if it works yet.
Thanks
Safety Car
Joined: Apr 2011
Posts: 3,660
Likes: 22
Its a pointless piece of hardware. Its there to prevent back-feeding as Jack said, but the only way it can get a back feed is if there is already a damaged BCM..so whats the point? None.
Mine was removed 10 yrs ago and there have been no ill effects.
Mine was removed 10 yrs ago and there have been no ill effects.
Burning Brakes
Joined: Dec 2008
Posts: 1,021
Likes: 7
From: Morgan Hill and Marina California
It's very common to put a diode across a coil. The coil gets charged
up when engaged, and then gets a reverse voltage when the charging
goes away. The diode prevents that reverse voltage from causing
damage and electrical noise.
This just like the way an ignition coil works, except in an ignition coil,
the reverse voltage fires the spark plug.
If it were useless, GM would have left it off.
Chuck
up when engaged, and then gets a reverse voltage when the charging
goes away. The diode prevents that reverse voltage from causing
damage and electrical noise.
This just like the way an ignition coil works, except in an ignition coil,
the reverse voltage fires the spark plug.
If it were useless, GM would have left it off.
Chuck
Team Owner
Joined: Sep 2003
Posts: 25,384
Likes: 2,736
It's very common to put a diode across a coil. The coil gets charged
up when engaged, and then gets a reverse voltage when the charging
goes away. The diode prevents that reverse voltage from causing
damage and electrical noise.
This just like the way an ignition coil works, except in an ignition coil,
the reverse voltage fires the spark plug.
If it were useless, GM would have left it off.
Chuck
up when engaged, and then gets a reverse voltage when the charging
goes away. The diode prevents that reverse voltage from causing
damage and electrical noise.
This just like the way an ignition coil works, except in an ignition coil,
the reverse voltage fires the spark plug.
If it were useless, GM would have left it off.
Chuck
Last edited by WVZR-1; Feb 17, 2013 at 06:28 PM.
