A different Temperature guage question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jemost 72 · 02-10-2003, 04:24 AM

I've been trying to get the factory temp guage to work with no luck. I installed a new temp sending unit and discovered the green wire was not hot.?. With a test light, I checked the back of the guage itself and it did have power. I did a search and discovered most folks have a ground problem that makes the guage peg to hot..mine is dead on cold. When I ground the back of the guage, the needle pegs hot, so I assume that should show the guage is working. Can some1 point me in the direction I need to be checking. Exactly where does the green wire go to??
T.I.A. for any info!

JimKshortstep4x4 · 02-10-2003, 08:30 AM

The green wire connects to the sensor on the engine. The engine block sensor is located on the left side of the engine between no. 1 and no. 3 spark plugs. With the key on and grounding the green wire, the dash gauge should peg. If it doesn't you may have a wiring problem. If it pegs, then the sensor is probably bad.

Jim

Jemost 72 · 02-10-2003, 01:24 PM

I think its a wire problem. The grn wire at the sending unit has no power..does nothing to the guage when grounded.......however, if I ground the guage itself, it will peg. ???

JimKshortstep4x4 · 02-10-2003, 03:04 PM

It sounds like your green wire is broken somewhere. I would try unplugging at the firewall and test continuity from there to your gauge. Also, you can test continuity back to the block sensor. An ohm meter is one way or you can set up a test light.

Good Luck,

Jim

02-10-2003, 04:24 AM	#1
Jemost 72 Southern Bowties Join Date: Jan 2003 Location: Fort Worth, TX Posts: 240	A different Temperature guage question I've been trying to get the factory temp guage to work with no luck. I installed a new temp sending unit and discovered the green wire was not hot.?. With a test light, I checked the back of the guage itself and it did have power. I did a search and discovered most folks have a ground problem that makes the guage peg to hot..mine is dead on cold. When I ground the back of the guage, the needle pegs hot, so I assume that should show the guage is working. Can some1 point me in the direction I need to be checking. Exactly where does the green wire go to?? T.I.A. for any info! __________________ 1972 Cheyenne 350/350

02-10-2003, 01:24 PM	#3
Jemost 72 Southern Bowties Join Date: Jan 2003 Location: Fort Worth, TX Posts: 240	I think its a wire problem. The grn wire at the sending unit has no power..does nothing to the guage when grounded.......however, if I ground the guage itself, it will peg. ??? __________________ 1972 Cheyenne 350/350

02-10-2003, 08:30 AM	#2
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	The green wire connects to the sensor on the engine. The engine block sensor is located on the left side of the engine between no. 1 and no. 3 spark plugs. With the key on and grounding the green wire, the dash gauge should peg. If it doesn't you may have a wiring problem. If it pegs, then the sensor is probably bad. Jim

02-10-2003, 03:04 PM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	It sounds like your green wire is broken somewhere. I would try unplugging at the firewall and test continuity from there to your gauge. Also, you can test continuity back to the block sensor. An ohm meter is one way or you can set up a test light. Good Luck, Jim



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