Gauge removed and connected to a spare battery I had in my shed.
Removed thermistor from front bumper bar (passenger, LHS) and used it to measure the inside temperature (which are the Red and Red/White wires at the back of the gauge, these can be seen in the fourth photo)
and then tested the outside temperature (you can see the thermistor in this picture which has some spare "speaker wires" running from it into the back of the gauge to the Black and Black/White wires)
Note there is a 3 degree difference between both temperatures even though both were measured at the same spot and the same time, my work shed. The readings should be the same but as the gauge is almost 30 years old there is some inaccuracy.
A view from behind showing how the wires are connected. Note: Blue/White wire to positive terminal and Black/Green is negative and the Black and Black/White going to the thermistor
A close up of the light blue coloured worn out 62 ohm 2 Watt resistor in the bottom left corner (it was very hot and working intermittently). If you touched it with the plastic handle of a screw driver it went off, and if you tapped on the front of the gauge it would start working again. If you look close you can see the "burn" marks from where it has been over-heating.
Will be continued on my next post....stayed tuned as the replacement resistor is still coming as its "in the post"
Removed thermistor from front bumper bar (passenger, LHS) and used it to measure the inside temperature (which are the Red and Red/White wires at the back of the gauge, these can be seen in the fourth photo)
and then tested the outside temperature (you can see the thermistor in this picture which has some spare "speaker wires" running from it into the back of the gauge to the Black and Black/White wires)
Note there is a 3 degree difference between both temperatures even though both were measured at the same spot and the same time, my work shed. The readings should be the same but as the gauge is almost 30 years old there is some inaccuracy.
A view from behind showing how the wires are connected. Note: Blue/White wire to positive terminal and Black/Green is negative and the Black and Black/White going to the thermistor
A close up of the light blue coloured worn out 62 ohm 2 Watt resistor in the bottom left corner (it was very hot and working intermittently). If you touched it with the plastic handle of a screw driver it went off, and if you tapped on the front of the gauge it would start working again. If you look close you can see the "burn" marks from where it has been over-heating.
Will be continued on my next post....stayed tuned as the replacement resistor is still coming as its "in the post"
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