The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > Heavy Haulers

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-12-2018, 05:34 PM   #1
Triplel40
Registered User
 
Join Date: Jan 2018
Location: Parma, ID
Posts: 5
'68 C60 temp gauge

Hello! I've been creeping around the forums for years and finally made an account. I have a '68 C60 farm truck with a 366 in it. The temp gauge never worked when I got the truck, but if you touch the sending unit wire to ground it pegs hot, so I know the gauge works. Being a C60 I couldn't find a sending unit listed for it anywhere. Working with my local NAPA guy we found a sending unit out of a 68 2500 396 truck that looks identical, but after installing it today the gauge still never gets off cold. Does anybody know what the resistance cold/hot should be for this truck's sending unit? Anybody know of where to get the right one? Any other ideas?

This is the sending unit I have now:
https://www.napaonline.com/en/p/ECHTS6469


~EDIT the old sending unit says "AC-Made In U.S.A.-12 VOLT" but I don't see any part numbers on it.
Thanks!
__________________
Lance
'88 RCLB K1500 Scottsdale Original 305/5spd 325xxx miles.(Build Thread)
'56 Studebaker C-Cab Pickup 259 V8/4spd (Build Thread)
'80 Chevy Luv 4x4 (Build Thread)
'68 Chevy C60 366/5+2 Dump Bed

Last edited by Triplel40; 01-12-2018 at 06:22 PM.
Triplel40 is offline   Reply With Quote
Old 01-12-2018, 07:49 PM   #2
LockDoc
The Original Thread Killer

 
LockDoc's Avatar
 
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 18,476
Re: '68 C60 temp gauge

-
There are two different sending units, one for the idiot lights and one for the gauges. I bet you have the wrong one. I can't tell you what the ohm readings should be but I would bet it's the sender..... Nice looking truck!

LockDoc
__________________
Leon

Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles
LockDoc is offline   Reply With Quote
Old 01-12-2018, 08:06 PM   #3
demian5
Registered User
 
demian5's Avatar
 
Join Date: Aug 2016
Location: Lake Forest, CA
Posts: 1,525
Re: '68 C60 temp gauge

Dude with the dual thermostats and the huge radiator, it may never get warm! LOL!

But LockDoc is right. Some of those had an idiot light AND a gauge. One on each head.
__________________
"Work hard, use your vacation days."
1970 C15 GMC Long Bed
1986 C20 Scottsdale (grandpa truck)
1964 Impala SS
1959 Austin Healey 100-6 BN6
Instagram: C10sofOC
demian5 is offline   Reply With Quote
Old 01-13-2018, 01:22 PM   #4
rkn463
Registered User
 
rkn463's Avatar
 
Join Date: Jan 2012
Location: Fort Worth, Texas
Posts: 556
Re: '68 C60 temp gauge

Quote:
Originally Posted by LockDoc View Post
-
There are two different sending units, one for the idiot lights and one for the gauges. I bet you have the wrong one. I can't tell you what the ohm readings should be but I would bet it's the sender..... Nice looking truck!

LockDoc
The sender for the idiot lights is just a switch, normally open and closed if the temp is exceeded. If it is the wrong sender then it will just show open on the ohm meter during normal operation. I took a quick look at the part listed and it looks right. The one for the idiot light has a spade terminal and the one for the gauge has the round nub sticking out, you can see drawings on the LMC site, page 187.

Check the wire and make sure it is not damaged. Basically your temp gauge is an ohm meter, so anything affecting conductivity will make it read wrong. When I first got my 68 back together I was reading cold or barely registering. My wire had been cut and was twisted together and taped, when I fixed it with solder and heat shrink the problem was resolved.

-Richard
__________________
I may have too many Chevys... Is that possible?
68 c50 pickup build: http://67-72chevytrucks.com/vboard/s...d.php?t=704713
rkn463 is offline   Reply With Quote
Old 01-15-2018, 03:03 AM   #5
Triplel40
Registered User
 
Join Date: Jan 2018
Location: Parma, ID
Posts: 5
Re: '68 C60 temp gauge

Definitely have the right sending unit between the two options I found. I stripped the insulation back off of the wire and it is pretty badly corroded inside. I'll run a new wire to the gauge tomorrow and let you know what happens!
__________________
Lance
'88 RCLB K1500 Scottsdale Original 305/5spd 325xxx miles.(Build Thread)
'56 Studebaker C-Cab Pickup 259 V8/4spd (Build Thread)
'80 Chevy Luv 4x4 (Build Thread)
'68 Chevy C60 366/5+2 Dump Bed
Triplel40 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 09:29 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com