light gray wire to fuel guage

[R77K10]

the light gray wire to the fuel guage at the instrument panel harness connector in the 77

it is full ground ??

or ?

thanks!

 

[R77K10]

ttt

really need to know what this gray wire is for

thanks

 

[R77K10]

alright well i tested it with the digital multimeter and its full ground, exact same reading as when i test on bare metal ground in the cab- 12.5 volts


i also tested the fuel guage wire again and its 69.3 ohms right now

guage reads 7/8 of a tank currently but i am lucky if i have half a tank of gas in it right now, id be really surprised if i did,

ideas, comments, suggestions ?

thanks

 

[yellowK20]

Have you checked your grounds at the tanks??? you live in the rust belt might be worth looking at

 

[R77K10]

hey there,
right, but if ground was gone at the tank then wouldnt i not have the 69.3 ohms reading in the tank wire ?

it was a dual tank truck until recently when i permanently removed the pass side one

all in order to try and fix this guage not reading issue

the pass side tank sender was dead, i found out, after testing it's wire,


but the driver side seems to read fine,

yet the damn guage still wont read right, and neither will the other guage i tried,


so humm..

its insane..


thanks

 

[yellowK20]

hey there,
right, but if ground was gone at the tank then wouldnt i not have the 69.3 ohms reading in the tank wire ?

it was a dual tank truck until recently when i permanently removed the pass side one

all in order to try and fix this guage not reading issue

the pass side tank sender was dead, i found out, after testing it's wire,


but the driver side seems to read fine,

yet the damn guage still wont read right, and neither will the other guage i tried,


so humm..

its insane..


thanks

Do you have a same vintage sender that you know to be good??? you could hook it up and then see if it works like it should. sorry I'm not much help if mine go bad I #1 Clean connections/inspect wires/test #2 replace/retest. and usually that covers the problem so I've never dove in much farther. maybe the tank switch????

 

[R77K10]

true i could try another sender outside of the tank

i was kinda wanting to avoid it but i may have no choice

whats kinda funny(well not funny, but) is that the guage seems ot be working now all of a sudden after having checked the wires as the instrument cluster harness plug the other day and its reading 3/4 tank now and seem to be moving a little bit when braking and turning and such

so i dunno

im gonna keep running it and just hope that its accurate and working and that i dont get stranded lol, i know i have alot of gas in the tank and that the truck uses very little gas, i drive it very easy and it has a brand new Q jet on it and the 400 engine is in extremely good condition runs like brand new, and is literally spotless inside, in the lifter gallery and in the heads i know, never nay smoke, not even a puff of it at startup, nothin, so,.




dont have tank switch anymore,
no dual tanks anymore,
i removed all that- and the pass side tank too,
im running driver side tank straight up now,
for a while now


thanks