Water Temp sending unit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

joerocks · 01-20-2012, 01:14 AM

posted in electrical, but thought I might get more traffic here

on a 1970 C20 with a BB396, anyone know which wire coming from the firewall wiring harness goes to the sending unit? pictures would be helpful as the original harness on this truck is all hacked up. Thanks Joe

OhioDan · 01-20-2012, 09:01 AM

On mine, it's a green wire. Here's a pic. Below manifold, between plug 1 and 3. Hope this helps?

hayhauler71 · 01-20-2012, 10:50 PM

green wire big and small block

joerocks · 01-25-2012, 03:16 PM

thanks for the replies, anyone know where it comes out of the firewall? this harness is all hacked up, and I don't have any green wires coming from the main bunch of wires on that plastic block coming out. Does this one come out thru there or is it in another spot?

dcasalena · 01-25-2012, 04:05 PM

I replaced wiring past summer but still have the original firewall connector. On that it is the bottom row, left side, middle spade. (or if I'm looking a it upside down it would be the top row, right side, middle spade). It was next to a tan wire.

joerocks · 01-26-2012, 09:56 AM

Quote:

Originally Posted by dcasalena

I replaced wiring past summer but still have the original firewall connector. On that it is the bottom row, left side, middle spade. (or if I'm looking a it upside down it would be the top row, right side, middle spade). It was next to a tan wire.

thanks, I appreciate the replies guys. I will try and get it figured out today, I finally fixed all the lighting on the gauges and am tackling the wiring now.

01-20-2012, 01:14 AM	#1
joerocks Registered User Join Date: Dec 2003 Location: gilbertsville,KY Posts: 111	Water Temp sending unit posted in electrical, but thought I might get more traffic here on a 1970 C20 with a BB396, anyone know which wire coming from the firewall wiring harness goes to the sending unit? pictures would be helpful as the original harness on this truck is all hacked up. Thanks Joe __________________ 1992 Jeep Cherokee 4.0 AUTO 1972 C10 350/350 1971 C1500 350/350 1970 C20 396/400

01-20-2012, 09:01 AM	#2
OhioDan Registered User Join Date: Apr 2002 Location: New Carlisle, Ohio,USA Posts: 1,404	Re: Water Temp sending unit On mine, it's a green wire. Here's a pic. Below manifold, between plug 1 and 3. Hope this helps? Attached Images __________________ LIFE AIN'T EASY WHEN YER FAT AND GREASY! GMC= Got More Class! 1970 GMC LWB, Fleetside, 350/4spd, Flowmaster "40's", 2002 GMC 16" Rallies, cowl hood,and added a bunch of options that weren't there when I started.

01-20-2012, 10:50 PM	#3
hayhauler71 Registered User Join Date: Aug 2009 Location: St. Paul MN. Posts: 1,996	Re: Water Temp sending unit green wire big and small block __________________ Fuzzy

01-25-2012, 03:16 PM	#4
joerocks Registered User Join Date: Dec 2003 Location: gilbertsville,KY Posts: 111	Re: Water Temp sending unit thanks for the replies, anyone know where it comes out of the firewall? this harness is all hacked up, and I don't have any green wires coming from the main bunch of wires on that plastic block coming out. Does this one come out thru there or is it in another spot? __________________ 1992 Jeep Cherokee 4.0 AUTO 1972 C10 350/350 1971 C1500 350/350 1970 C20 396/400

01-25-2012, 04:05 PM	#5
dcasalena Registered User Join Date: Jan 2011 Location: Acton, MA Posts: 220	Re: Water Temp sending unit I replaced wiring past summer but still have the original firewall connector. On that it is the bottom row, left side, middle spade. (or if I'm looking a it upside down it would be the top row, right side, middle spade). It was next to a tan wire.



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