faulty transmission temp. reading

[George Lowry]

Bob,

The way I was taught to do a quick check of a temp system was to
ground the wire from the gage at the sensor. With it grounded, the
gage should read full scale high. With no connection, it should read
full scale low. With the indication you have, I would hazard a guess
that you have a high resistance short to ground in the wire some
place. Might be easier to run a new wire than to try to find the short.

George Lowry
'95 WBDA 4203 & GM 4106 (for sale)
Spearfish, SD

Bob & Carol Howald` wrote:

> Last year while on a trip my transmission temp suddenly went to 300
> degrees. I immediatley stopped and checked it out and determined that
> the temp was in the normal range around 170. The gage stayed at 300
> degrees the rest of the trip. I ordered a new gage from BB and
> installed it. After that the temp would go to 250 degrees and stay in
> that area. Again I assured myself that the temp was in fact normal
> 170.Thinking that it could be a bad sending unit in the transmission, I
> changed it this week when I had the pan off. I started the coach up and
> the transmission temp. went to 230-260 in about 5 minutes. again I
> assured myself that temp was in fact normal about 95 degrees just
> idling. I rigged up my old gage under the coach at the sending unit
> using different wire from sending unit, new ground wire and a hot wire
> from the battery. It seemed to give a normal reading at this point.
> What do you suspect the problem to be? bad ground at the dash? bad wire
> from the sending unit? Any suggestions would be welcome. Thanks Bob
> 93pt Illinois
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