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Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> 1965 GM factory temperature guage pins under cranking. NORMAL?????
Post Info TOPIC: 1965 GM factory temperature guage pins under cranking. NORMAL?????
beaumontguru


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1965 GM factory temperature guage pins under cranking. NORMAL?????
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I just put in a factory cluster in my 65 chevelle

All tested and working great.  Car runs up to temp and all gauges are dead accurate.  Temp reads perfect, oil as well.

My question is:

When i turn the key "on" the guages power up-as normal

But, when i hit the key to "crank"  the temp needle pegs itself violently over to the Hot side.  Once the car is running and the key is back to the "on/run" position the needle goes to the correct temp, and all is wonderful, needle reads dead acurate.  

Bench tested the whole thing before install,  had the sender in pot of water on stove, etc, etc.  the guage and sender are grounded no problems.

My question is:  normal for the needle to pin over like that only under cranking???

this car had an idiot light originally but i studied all the schematics and the wiring was the same, just the sender and the conector on the back of the gauage that was different from what i saw.

The reason i ask is that my 67-72 trucks both have temp guages and they do not do this.



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Beaumontguru

MY BEAUMONT HAS 4 STUDDED TIRES AND 2 BLOCKHEATERS......AND LOTS OF OIL UNDERNEATH.  The other one has a longer roof.
4SPEED427


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Yes, it's a gauge test. I didn't realize the pickups don't do that.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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beaumontguru


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What is meant by a guage test?  i finally found that term used on an 80's camaro forum.  

So it is normal for it to peg over like that?

Dang i have been worrying about this all day because i fired up my 71 truck and it didnt do it(its all factory original)



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Beaumontguru

MY BEAUMONT HAS 4 STUDDED TIRES AND 2 BLOCKHEATERS......AND LOTS OF OIL UNDERNEATH.  The other one has a longer roof.
4SPEED427


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It's the same idea as the bulb test when you turn on your key and the "temp" lights up when you crank it. Simply showing you that the gauge circuit is good.

I wonder why they wired the pickups different? Or maybe it's just because it's later. Maybe the cars didn't do that either in later years.



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
beaumontguru


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Awesome, now i can breath!!  Thank you, thank you , thank you.

 

I will have to check my 68 GMC in the spring to see if it does that, but the 71 does not

Funny because according the the "always accurate interweb" 3rd gen 80's camaros do have the "test"



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Beaumontguru

MY BEAUMONT HAS 4 STUDDED TIRES AND 2 BLOCKHEATERS......AND LOTS OF OIL UNDERNEATH.  The other one has a longer roof.
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