cruise control question

[richard guthart]

I just purchased a rebuilt cruise control transducer from Checker Auto. The
instructions which came with it contain the same detailed electrical and vacuum
checkout procedures found in our GMC service manual. According to these
instructions, however, the "resistance wire" which supplies the transducer's
coil is supposed to read 22-24 ohms. The GMC manual says 38-42 ohms. (Mine reads
40.)

Anyone know if I need to replace the resistance wire? Can I damage the rebuilt
transducer by trying to use it without replacing the wire?

Richard

 

[mark grady]

Better too high a resistance than too low. The hold solenoid coil in the
transducer is usually the part that fails (electrically at least);
mechanically its the bearing on the eddy plate that goes first.

As long as the transducer will engage and hold, (and it probably will) don't
worry about it.

Note too that some original GMC transducers are 'three wire' units with a
separate signal lead to the dash cruise light. Only Buick/Cad (maybe some
Olds) used this configuration. All others are 2 wire with no engaged
(cruise) signal light. The 2 wire units will work just the same.

Mark

|-----Original Message-----
|From: owner-gmcmotorhome
|[mailtowner-gmcmotorhome]On Behalf Of Richard Guthart
|Sent: Thursday, August 05, 1999 7:16 PM
|To: gmcmotorhome
|Subject: GMC: cruise control question
|
|
|I just purchased a rebuilt cruise control transducer from Checker Auto. The
|instructions which came with it contain the same detailed
|electrical and vacuum
|checkout procedures found in our GMC service manual. According to these
|instructions, however, the "resistance wire" which supplies the
|transducer's
|coil is supposed to read 22-24 ohms. The GMC manual says 38-42
|ohms. (Mine reads
|40.)
|
|Anyone know if I need to replace the resistance wire? Can I damage
|the rebuilt
|transducer by trying to use it without replacing the wire?
|
|Richard

 

[richard guthart]

Thanks, Mark.

I tried it and it works.

If anyone needs a replacement transducer take note of the following number:
Checker Auto #36-102 ($60.99 plus core). Checker lists this one for the '76
Caddy Eldorado and the number cross references to GMC #2503 0712, the number
shown in GMC dealer's computer as the successor for the one listed in our GMC
Motorhome parts manual.

The AC/Delco rebuilds have been discontinued. Cinnabar also says they are unable
to get rebuilds, so I was happy to find one at Checker. It's rebuilt by
A1-Cardone.

Richard

- ----- Original Message -----
From: Mark Grady
To:
Sent: Thursday, August 05, 1999 8:41 PM
Subject: RE: GMC: cruise control question

> Better too high a resistance than too low. The hold solenoid coil in the
> transducer is usually the part that fails (electrically at least);
> mechanically its the bearing on the eddy plate that goes first.
>
> As long as the transducer will engage and hold, (and it probably will) don't
> worry about it.
>
> Note too that some original GMC transducers are 'three wire' units with a
> separate signal lead to the dash cruise light. Only Buick/Cad (maybe some
> Olds) used this configuration. All others are 2 wire with no engaged
> (cruise) signal light. The 2 wire units will work just the same.
>
> Mark
>
> |-----Original Message-----
> |From: owner-gmcmotorhome
> |[mailtowner-gmcmotorhome]On Behalf Of Richard Guthart
> |Sent: Thursday, August 05, 1999 7:16 PM
> |To: gmcmotorhome
> |Subject: GMC: cruise control question
> |
> |
> |I just purchased a rebuilt cruise control transducer from Checker Auto. The
> |instructions which came with it contain the same detailed
> |electrical and vacuum
> |checkout procedures found in our GMC service manual. According to these
> |instructions, however, the "resistance wire" which supplies the
> |transducer's
> |coil is supposed to read 22-24 ohms. The GMC manual says 38-42
> |ohms. (Mine reads
> |40.)
> |
> |Anyone know if I need to replace the resistance wire? Can I damage
> |the rebuilt
> |transducer by trying to use it without replacing the wire?
> |
> |Richard
>