HELP!!! gas gauge problems....need help now. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chevyguy111786 · 05-28-2003, 07:01 PM

My brown wire going from the sending unit to the gauge is broken. I know that is my problem. My question is where does it connect on the gas gauge? does it connect to the wire harness or to one of the two bolts on the back? if it connects to one of the bolts, which one and should there also be a ground connected to the other one? PLEASE HELP ME! i need my truck tonight.

da-burb · 05-28-2003, 07:08 PM

it connects to the wire harness at the fuse block. It is grounded via the dash cluster itself.

ddsmith · 05-28-2003, 09:37 PM

Ok I'll give this a shot. I have the wiring diagram which can be found on the forum. Search wire diagrams and follow the geocities link. The way this works was explained before under gas gage topic. The power is feed to the gage through a 20 gauge pink wire coming from the fuse panel to the gage cluster connector. I believe this is where the circuit board comes into play. The current flows from the pink wire through the circuit board to the hot side of the gas gage. It flows through the gage and exits via the circuit board to a 20 gauge tan wire back to the fuse box where it connects to a 18 gauge tan wire. This connection is just a convient place to tie the wires together. The 18 gauge tan wire then runs to the gas sending unit where the current flow reaches ground through a 18 gauge black wire attached between the sending unit and a good ground after flowing through the variable resistor(sending unit). Hope this helps out. The part of this that I'm a little iffy on is the circuit board because I haven't ripped into one of these yet. The new truck (69 C20) is only days away from being able to see first hand.

Don

9teen69 · 05-28-2003, 10:16 PM

See my post:
http://67-72chevytrucks.com/vboard/s...threadid=53282

The brown wire runs from the gas tank directly to the fuse block - it's labled "FUEL GA"

The bolts on the back of the gauge are only used by the circuit board - I kept thinking they needed wires hooked up to them too.

Chevyguy111786 · 05-29-2003, 12:06 AM

FIXED IT! i hooked the brown wire back up to one of the same color....and it happened to be right. good luck tonight i guess. THANKS GUYS!

05-28-2003, 07:01 PM	#1
Chevyguy111786 Registered User Join Date: Apr 2003 Location: Garland, Texas Posts: 1,127	HELP!!! gas gauge problems....need help now. My brown wire going from the sending unit to the gauge is broken. I know that is my problem. My question is where does it connect on the gas gauge? does it connect to the wire harness or to one of the two bolts on the back? if it connects to one of the bolts, which one and should there also be a ground connected to the other one? PLEASE HELP ME! i need my truck tonight.

05-28-2003, 07:08 PM	#2
da-burb "Ochre Ogre" Join Date: Apr 2000 Location: Springfield, MN Posts: 3,558	it connects to the wire harness at the fuse block. It is grounded via the dash cluster itself. __________________ Bowtie Truck Stop Inc. Mid-West GM Truck Restoration Parts Supplier Your Key Parts, Auto Metal Direct, Dynacorn, and Goodmark dealer. like us @ www.facebook.com/BowtieTruckStop 1971 C-10 Suburban (Ochre) 1971 K-10 Suburban (Ochre) 1972 C-10 Suburban (Ochre) 1972 K-20 Suburban (Yellow- that just aint right!) Springfield, Minnesota 56087

05-28-2003, 09:37 PM	#3
ddsmith Glowing since 1978 Join Date: Mar 2001 Location: Lusby,MD,USA Posts: 532	Ok I'll give this a shot. I have the wiring diagram which can be found on the forum. Search wire diagrams and follow the geocities link. The way this works was explained before under gas gage topic. The power is feed to the gage through a 20 gauge pink wire coming from the fuse panel to the gage cluster connector. I believe this is where the circuit board comes into play. The current flows from the pink wire through the circuit board to the hot side of the gas gage. It flows through the gage and exits via the circuit board to a 20 gauge tan wire back to the fuse box where it connects to a 18 gauge tan wire. This connection is just a convient place to tie the wires together. The 18 gauge tan wire then runs to the gas sending unit where the current flow reaches ground through a 18 gauge black wire attached between the sending unit and a good ground after flowing through the variable resistor(sending unit). Hope this helps out. The part of this that I'm a little iffy on is the circuit board because I haven't ripped into one of these yet. The new truck (69 C20) is only days away from being able to see first hand. Don __________________ 66 Chevy C30 Stakebody Dump, PS,PB, 327cu in 71 Corvette Coupe 454 4 speed 69 Chevy C20 Custom Camper

05-28-2003, 10:16 PM	#4
9teen69 Registered User Join Date: Sep 2002 Location: Austin, Texas Posts: 1,048	See my post: http://67-72chevytrucks.com/vboard/s...threadid=53282 The brown wire runs from the gas tank directly to the fuse block - it's labled "FUEL GA" The bolts on the back of the gauge are only used by the circuit board - I kept thinking they needed wires hooked up to them too. __________________ 72 Cheyenne SWB C10 (daily driver) (Super fake cause I just love the glovebox emblem) 70 Camaro RS (frame-off in pieces) 70 Camaro RS (daily driver backup) 69 Custom LWB C10 (son now drives)

05-29-2003, 12:06 AM	#5
Chevyguy111786 Registered User Join Date: Apr 2003 Location: Garland, Texas Posts: 1,127	FIXED IT! i hooked the brown wire back up to one of the same color....and it happened to be right. good luck tonight i guess. THANKS GUYS!



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