gas guage dilema! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

wildwln · 06-15-2011, 01:06 PM

i just joined this Forum today but i have been visiting here many times in the past, i find the expertise on this site remarkable and i hope to add to it at some point. I am a long time chevy/gmc truck owner and have my cherried out 85 swb 4x4 still after buying it bran new...anyway my son has just purchased a 1/2 ton 74 GMC 454 and is allowing me to do all the work on it!

the fuel guage peggs all the way past the Full marker each time...the truck is equipped with a passenger side tank which appears factory and on the drivers side there is a large metal square gas tank which incidently has no ground wire to the frame altho the passenger side does...these tanks are piped to two solinoid valves located between the two....

so todate i have run a new lead wire from each of the sending tanks down the frame and up into the cabin...i have run a new lead wire from one of the solinoid valves down the frame and into the cabin..(the solinoids are jumpered together with a common wire)...inside the cabin is a simple toggle switch to hook up these wires...i placed a power wire from the toggle post into the fuse box on a ign post...i connected each of my new sending unit leads to the toggle switch...i connected the new lead from the solinoids to the toggle switch and here is where i get stumped..

this is a 5 connector toggle switch and i have 1 power, 2 senders and 1 solinoid connected for a total of 4..i would think my final connection should either to be a frame ground or too the guage itself shouldnt it?...but since the instrument cluster is wired with the plastic panel circuitry at the back, there seems to me no means to hard wire the guage itself...incidentally i tried a spare guage from my 85 in the 74 and it pegged all the way past E-opposite of the original guage which pegged past F...i can hear the solinoids click as i toggle the switch back n forth, but the guage no worky...

i really would appreciate any input and advice you mechanical wizards could offer me at this point, i am flustered and dumbfounded and reaching for the dynamite at this point~~

06-15-2011, 01:06 PM	#1
wildwln Registered User Join Date: Jun 2011 Location: salt lake city, Utah Posts: 10	gas guage dilema! i just joined this Forum today but i have been visiting here many times in the past, i find the expertise on this site remarkable and i hope to add to it at some point. I am a long time chevy/gmc truck owner and have my cherried out 85 swb 4x4 still after buying it bran new...anyway my son has just purchased a 1/2 ton 74 GMC 454 and is allowing me to do all the work on it! the fuel guage peggs all the way past the Full marker each time...the truck is equipped with a passenger side tank which appears factory and on the drivers side there is a large metal square gas tank which incidently has no ground wire to the frame altho the passenger side does...these tanks are piped to two solinoid valves located between the two.... so todate i have run a new lead wire from each of the sending tanks down the frame and up into the cabin...i have run a new lead wire from one of the solinoid valves down the frame and into the cabin..(the solinoids are jumpered together with a common wire)...inside the cabin is a simple toggle switch to hook up these wires...i placed a power wire from the toggle post into the fuse box on a ign post...i connected each of my new sending unit leads to the toggle switch...i connected the new lead from the solinoids to the toggle switch and here is where i get stumped.. this is a 5 connector toggle switch and i have 1 power, 2 senders and 1 solinoid connected for a total of 4..i would think my final connection should either to be a frame ground or too the guage itself shouldnt it?...but since the instrument cluster is wired with the plastic panel circuitry at the back, there seems to me no means to hard wire the guage itself...incidentally i tried a spare guage from my 85 in the 74 and it pegged all the way past E-opposite of the original guage which pegged past F...i can hear the solinoids click as i toggle the switch back n forth, but the guage no worky... i really would appreciate any input and advice you mechanical wizards could offer me at this point, i am flustered and dumbfounded and reaching for the dynamite at this point~~



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