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 > General Truck Forums > Electrical

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 07-31-2018, 10:49 PM   #1
ethankane
Registered User
 
ethankane's Avatar
 
Join Date: Jan 2016
Location: harrison, mi
Posts: 4
Need help with cluster

I am almost done with my 71 c10 after two years of work (with a lot of help reading this forum) I an getting the electrical back together inside. I installed the cluster and hooked it up.
All seemed good truck fired up headlights and dash lights work.
Only problems were
Fuel gauges pegged past full with only a couple gallons of gas.
Temp gauge pegged.
No temp light when the key is turned on.
So I read the forum grounded the bottom peg on the temp gauge still nothing there.
Ran entire new line to fuel tank because if I ground the line it worked. Still nothing.

Then I was testing the cluster with an electrical tester.
When I check the #2 wire on the plug there is barely any signal through the tester but the temp light comes on with the key on.
When I check #4 same dim light on tester and the fuel gauge works.
Then if I hit the top peg on the temp gauge same dim light and the needle moves on the gauge.

What an I missing. Any help is appreciated.
Thanks
ethankane is offline   Reply With Quote
Old 08-01-2018, 01:21 AM   #2
VetteVet
Msgt USAF Ret
 
VetteVet's Avatar
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,177
Re: Need help with cluster

.................................

Quote:
Originally Posted by ethankane View Post
I am almost done with my 71 c10 after two years of work (with a lot of help reading this forum) I an getting the electrical back together inside. I installed the cluster and hooked it up.
All seemed good truck fired up headlights and dash lights work.
Only problems were

First of all let's establish whether you have a gauge dash or an idiot light dash.
Your post suggests that you have a light dash with an aftermarket temperature gauge.


Here is the connections for the gauge dash.


Name:  gauge connector.jpg
Views: 61
Size:  25.8 KB



Here is the connections for the light dash at the cluster plug


Name:  idiot light connector diagram.jpg
Views: 57
Size:  48.6 KB



The no. 2 terminal you're calling a temperature light is for the brake warning light on both types of dashes.
The temperature light is connected to terminal 5 on the light dash, and there is no connection to terminal 5 on the gauge dash. The temperature gauge sending wire is moved to terminal 6 on the gauge dash




Fuel gauges pegged past full with only a couple gallons of gas.


No connection to fuel sender in tank

Temp gauge pegged.

Gauge wire is grounded or wrong sender
No temp light when the key is turned on

You shouldn't have a temp light with a temperature gauge unless the gauge is aftermarket.

So I read the forum grounded the bottom peg on the temp gauge still nothing there.

Ground the wire from the sender to the gauge and the gauge should go to full hot. The bottom peg has to be grounded anyway, but to a good ground.

Ran entire new line to fuel tank because if I ground the line it worked. Still nothing.

Grounding the line puts the gauge to empty, so the gauge is working, you aren't getting signal from the fuel tank sender.

This wire runs from the no. 4 terminal on the gauge cluster plug to the fuse panel FUEL terminal, and then to the sender behind the seat. the terminal on the fuse panel is just a junction so you can run a wire directly to the tank from the no. 4 terminal, but first check to see if the tan wire is there that goes to the fuse panel. Do not put any voltage on this wire ever.

Then I was testing the cluster with an electrical tester.
When I check the #2 wire on the plug there is barely any signal through the tester but the temp light comes on with the key on.
It's the brake warning light and it should come on when the key is turned on, to test the bulb via the key switch.

When I check #4 same dim light on tester and the fuel gauge works.
Then if I hit the top peg on the temp gauge same dim light and the needle moves on the gauge.

You are probably grounding the gauges with the tester, and the readings are not accurate because they are not grounding through the senders.




Here is the diagram of the gauge cluster with the wire connections shown on the cluster plug. Notice the red dashed line on terminal 5 where there is no wire connected.




Name:  Dash  Layout Final.jpg
Views: 57
Size:  41.6 KB



What an I missing. Any help is appreciated.
Thanks
__________________
VetteVet

metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide

Growing old is hell, but it beats the alternative.
VetteVet is offline   Reply With Quote
Old 08-01-2018, 05:15 PM   #3
ethankane
Registered User
 
ethankane's Avatar
 
Join Date: Jan 2016
Location: harrison, mi
Posts: 4
Re: Need help with cluster

Ok I will keep at it. Thanks
ethankane is offline   Reply With Quote
Old 08-01-2018, 11:24 PM   #4
dmjlambert
Senior Member
 
dmjlambert's Avatar
 
Join Date: Apr 2016
Location: Cypress, TX
Posts: 1,094
Re: Need help with cluster

The only thing I would add is regarding "Fuel gauge pegged" is make sure your gas tank is grounded, or if plastic tank the sender metal should be grounded. If you recently painted and then put your tank in, you may not have a good bare metal connection where the tank is bolted inside the cab (or wherever it is).
dmjlambert 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 11:47 PM.


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