C2 temperature gauge expertise needed
I am trying to use a spare 67 gage cluster for a temperature gage when running the engine in a bare chassis. The temp sender reads about 700 ohms at a cool room temp and the resistance decreases when I warm the sender in my hand. I think the sender is operating OK.
I connected the sender body to battery ground and the sender terminal to the terminal of the gage closest to the bottom of the gage cluster (which is where the green wire connects to the gage in my car). When I attached the positive terminal of the battery to the upper terminal of the gage, it drove the gage to a stop way past 250 degrees. It stayed off scale when disconnected since there is apparently no spring to return the pointer to the normal range with the power removed. To return the gage to 100 degrees, I reversed the connections on the gage and disconnected the power when the pointer got to 100 degrees. It would have driven the gage all the way to a low stop way lower than 100 if I had not removed the power.
Is my sender really OK?
Is there some base resistor in the car wiring that the sender merely adds to? Or is the sender the only resistance to current in the gage circuit as it is in my setup? If there is a base resistor, what is its resistance in ohms?
Is my temp sensor simply no good?
I connected the sender body to battery ground and the sender terminal to the terminal of the gage closest to the bottom of the gage cluster (which is where the green wire connects to the gage in my car). When I attached the positive terminal of the battery to the upper terminal of the gage, it drove the gage to a stop way past 250 degrees. It stayed off scale when disconnected since there is apparently no spring to return the pointer to the normal range with the power removed. To return the gage to 100 degrees, I reversed the connections on the gage and disconnected the power when the pointer got to 100 degrees. It would have driven the gage all the way to a low stop way lower than 100 if I had not removed the power.
Is my sender really OK?
Is there some base resistor in the car wiring that the sender merely adds to? Or is the sender the only resistance to current in the gage circuit as it is in my setup? If there is a base resistor, what is its resistance in ohms?
Is my temp sensor simply no good?
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