Tweet
With the turn signal on the gas gauge will move with the turn signal each time it clicks, why? When I step on the brake pedal the gas gauge needle moves to the full position, why?
-
-
Re: gas gauge bounce
Richard, You don't say what year you're working with, but I can tell you that my 61 does the same thing. As to why, it relates to the drop in voltage that occurs at idle in a car with a generator. They won't charge at idle, and when you turn on the directional signal or step on the brakes, the voltage lowers. The gas gauge works off of a variable resistance, so a change in voltage will result in a change in the gauge reading. What I can't figure out is why the temp gauge doesn't do the same thing, since it basically works the same way and is powered by a parallel circuit. I have seen something about the grounding of the dash panel affecting this, but my dash is well grounded and again, why the gas gauge and not the temp gauge. I'm sure we have an electrical expert who can explain this. -
Re: gas gauge bounce
Richard, You don't say what year you're working with, but I can tell you that my 61 does the same thing. As to why, it relates to the drop in voltage that occurs at idle in a car with a generator. They won't charge at idle, and when you turn on the directional signal or step on the brakes, the voltage lowers. The gas gauge works off of a variable resistance, so a change in voltage will result in a change in the gauge reading. What I can't figure out is why the temp gauge doesn't do the same thing, since it basically works the same way and is powered by a parallel circuit. I have seen something about the grounding of the dash panel affecting this, but my dash is well grounded and again, why the gas gauge and not the temp gauge. I'm sure we have an electrical expert who can explain this.Comment
-
Re: gas gauge bounce
Hi Richard--There have been several posts on this subject, but for the life of me I can't find them. I'm sure Jack Humphrey will answer this in sensible terms. The major problem revolves around getting a GOOD ground in the circuit, especially at the fuel sending unit area. In the meantime, if you can get a copy of the NCRS Restorer (Spring 1995), there is great comprehensive article dealing with this subject, by Joe Calcagno. It explains the theory and fixes for this problem. Whenever I have to replace my 62 sending unit, I will incorporate the groung "fix". Cheers, DickComment
-
Re: gas gauge bounce
Hi Richard--There have been several posts on this subject, but for the life of me I can't find them. I'm sure Jack Humphrey will answer this in sensible terms. The major problem revolves around getting a GOOD ground in the circuit, especially at the fuel sending unit area. In the meantime, if you can get a copy of the NCRS Restorer (Spring 1995), there is great comprehensive article dealing with this subject, by Joe Calcagno. It explains the theory and fixes for this problem. Whenever I have to replace my 62 sending unit, I will incorporate the groung "fix". Cheers, DickComment
-
Re: gas gauge bounce
Check your battery charge level. If the battery does not have a full charge you will have the problem you describe.Comment
-
Re: gas gauge bounce
Check your battery charge level. If the battery does not have a full charge you will have the problem you describe.Comment
-
Re: Dancing Gas Gauge
Richard --- The solution won't be found in the earlier posts (archives, June 25) as the discussion then was for a '57 reading full, etc. I don't believe GM shop manuals cover your "interesting" phenomenon. Go straight to the RESTORER article that Dick has mentioned -- summary: "The cause is usually located in the ground circuit serving the rear lights and the fuel tank sending unit". Good luck.Comment
-
Re: Dancing Gas Gauge
Richard --- The solution won't be found in the earlier posts (archives, June 25) as the discussion then was for a '57 reading full, etc. I don't believe GM shop manuals cover your "interesting" phenomenon. Go straight to the RESTORER article that Dick has mentioned -- summary: "The cause is usually located in the ground circuit serving the rear lights and the fuel tank sending unit". Good luck.Comment
-
Re: gas gauge bounce
I pulled up this exact problem in the archives last week. The title was 62 Fuel Gauge and Heater Switch. It was dated 9/2/98 and posted by J. GranthamComment
-
Re: gas gauge bounce
I pulled up this exact problem in the archives last week. The title was 62 Fuel Gauge and Heater Switch. It was dated 9/2/98 and posted by J. GranthamComment
Comment