78 Centre Gauge problems
Thread Starter
Intermediate
Joined: Jun 2008
Posts: 33
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78 Centre Gauge problems
Hello, Been rebuilding a 78 corvette and are at the stage of putting in the gauges. So far I have the fuel gauge and the temp gauge both at the 3 oclock position and the battery gauge and oil gauge dont seem to be working at all. Any ideas where to start and does any one have a picture of the back of there gauges so I can make sure everything is ok
Thanks
Thanks
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
You need to start out by going to the small gauge connector and verify the wires are doing what they should be doing. What I mean by this is test the wires to see if they have power, verify they have good ground and then test the input wires for signal.
On the fuel gauge, if you peg full you are missing the input signal from the unit. On the temperature gauge, well it depends on how accurate your 3 o’clock is. Missing signal will make the gauge needle move to right at 3 while a gauge missing the ground will usually move just past 3 o’clock.
With the oil gauge not doing anything, well you need to test the wires first.
The amp gauge can be tested real easy too! I’ll have to add to this tomorrow. I’m out of time tonight! I've got a schematic that will do wonders for your testing.
Willcox
On the fuel gauge, if you peg full you are missing the input signal from the unit. On the temperature gauge, well it depends on how accurate your 3 o’clock is. Missing signal will make the gauge needle move to right at 3 while a gauge missing the ground will usually move just past 3 o’clock.
With the oil gauge not doing anything, well you need to test the wires first.
The amp gauge can be tested real easy too! I’ll have to add to this tomorrow. I’m out of time tonight! I've got a schematic that will do wonders for your testing.
Willcox
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Here is a picture that will show you what belongs on what gauge. Once you test these wires and see what they are doing post again. Then we'll move to the gauges or the senders based on what you find.
Willcox Inc.
Willcox Inc.
Last edited by Willcox Corvette; Jun 4, 2009 at 11:03 AM.
Thread Starter
Intermediate
Joined: Jun 2008
Posts: 33
Likes: 0
Hello for starters I am missing the low fuel warning thing in that left had corner would that make a difference. When I put the circuit tester on I am only showing power to the clock and the second power is he second one on the left according to the picture above
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
The fuel gauge temp gauge amp and oil pressure are all powered by the second one from the top. (on the left in the picture on the right hand side of the car). The low fuel warning will not stop the fuel gauge from working.
Now go to the blue colored wires and test them for ohms and then verify that the grounds are good!
You really want to check the blue wires for input signal. . . This is stated why in my first post.
Post again when you are done!
I'll check back in few hours to check.
Willcox Inc.
Now go to the blue colored wires and test them for ohms and then verify that the grounds are good!
You really want to check the blue wires for input signal. . . This is stated why in my first post.
Post again when you are done!
I'll check back in few hours to check.
Willcox Inc.
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