Crazy-@ss Fuel Gauge: New Information

[opus10583]

Hi,

My fuel gauge goes to 'fuller than 4/4' when I turn on the parking or headlights.

...I'll be reading wiring diagrams tonight.

Thanks,
Mark

[Sunracer]

Is it pegging or going much higher than the actual level? It is common for the guages tor ead a little higher when you flip on the lights, check your temp gauge for a similar phenomenon.

[124JOE]

my gas gauge did that over 4/4 then when over half it works fine then under half it flips out
up all the way then dead nothing but the low fuel light still works

$50 for a new sending unit

[opus10583]

Is it pegging or going much higher than the actual level? It is common for the guages tor ead a little higher when you flip on the lights, check your temp gauge for a similar phenomenon.

my gas gauge did that over 4/4 then when over half it works fine then under half it flips out
up all the way then dead nothing but the low fuel light still works
$50 for a new sending unit

Hi,

There's probably about 3.5 gallons in the tank, it reads about a third of a tank when the lights are off, seems to read fine at all levels until I turn the lights on, parking or head, then the needle swings past 4/4, pegging to the right. There is no effect on the temp gauge or tach, and the way my speedo cable sticks it could be adding -/+45deg of oscillation and I wouldn't notice.

Fuel gauge light isn't working.

Thanks,
Mark

[Schnauzer]

all my guages, tach fuel oil pressure temp, were wacky until I did the alternator up grade. I think it was low voltage. Since putting on the 95 amp alternator all of my electrical functions have smoothed out. Best thing I have ever up graded on my 76

[opus10583]

all my guages, tach fuel oil pressure temp, were wacky until I did the alternator up grade. I think it was low voltage. Since putting on the 95 amp alternator all of my electrical functions have smoothed out. Best thing I have ever up graded on my 76

I don't follow: How's more voltage going to un-crosswire my gauge?

Clearly something's wired wrong, and I should mention the previous stereo installation was wired all hot all the time using a BIG RED WIRE I can't find on any FIAT diagram... Not to mention, the proper but unused brown radio wire nearly poked me in the eye when I pulled the console.

Bought a multimeter, waiting for a cloudy weekend day.

Thanks,
Mark