| Re: [GMCnet] Poor Mileage solved [message #324618 is a reply to message #324617] |
Wed, 04 October 2017 22:39   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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Senior Member |
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Bruce,
I agree with your analysis. I'm especially attuned to that application of
diodes. It's too long for here but remind me sometime to tell you the
story, related to protective diodes, of how USAF was, in effect, repaid for
sending me back to school for 3 years to get my BSEE & MSEE. It was the
ONLY time, during the balance of my 23 years in USAF that I used anything
from those 3 years. :-)
Ken H.
On Wed, Oct 4, 2017 at 9:51 PM, Bruce Hislop wrote:
> Ken,
> I'm thinking the module may have a built-in reversed biased diode in
> parallel with its output switching transistor. It would be needed for the
> same
> reason a diode is put across a relay coil powered by any electronic
> device... to protect the output transistor from the reverse EMF as the coil
> field
> collapses.
>
> I would certainly remove it as I'm sure GM Engineers already installed the
> needed protection. If it failed shorted, it would certainly take out
> several modules before it was found.
>
> Just my electronic technician and farmboy mechanic opinion.
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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