My 66 is having some sort of instrument electrical issue that is sidelining it. After starting the engine and letting it run a few minutes the temp and fuel gage start slowly heading to the far right side of the gages and pegging there. The alternator seems to read high too although it's not going all the way over. If I shut the engine down and let it set for a few minutes, when I re-start it the gages read OK again and continue to do so for a minute or two, and then they start the steady progression all the way right as far as they can go.
My first thought was a sticking instrument voltage regulator so I bought a Standard replacement and plugged it in only to have it continue doing exactly the same thing. I've noticed that when the temp and gas gage start going over and I rev the motor up, while the alternator gage goes over quite a ways on the charging side, it will then start a frantic back and forth movement over there until I let it idle back down.
So - I've about exhausted the extent of my electrical know how at this point. Could it be just a bad voltage regulator under the hood that is overpowering the instrument regulator?
I haven't tried to take any system voltage checks yet - one of those things you only think of after putting the car up. Any thoughts or help is appreciated.
My first thought was a sticking instrument voltage regulator so I bought a Standard replacement and plugged it in only to have it continue doing exactly the same thing. I've noticed that when the temp and gas gage start going over and I rev the motor up, while the alternator gage goes over quite a ways on the charging side, it will then start a frantic back and forth movement over there until I let it idle back down.
So - I've about exhausted the extent of my electrical know how at this point. Could it be just a bad voltage regulator under the hood that is overpowering the instrument regulator?
I haven't tried to take any system voltage checks yet - one of those things you only think of after putting the car up. Any thoughts or help is appreciated.