[sheetmetal]

my fuel gauge is past full. i think i may have a ground problem but i cant find the wire loom dash ground on my 67 any ideas where to look? also the 4th fuse from the top has now power to it. i pulled the block loose and checked for loose connections behind it.is this a result of a loose ground? also the 5th fuse from the top is hot on both sides? WITH THE FUSE REMOVED? every thing else seems to work fine

 

[John_Muha]

Nobody around yet. well my thoughts for what they are worth.
You posted a lot of information. Better than too little. For starters you are lookng at too many things. Check out the wiring to the gage first and if you have another problem, post back.
Your fuel gage has two wires on it. Because it reads full, you have 12 volts on the pink wire. Disconnect the plug off the gage. Measure the tan wire, with a meter to a known good ground. The reading should be between 88 ohms and 0 ohms depending on how much fuel is in the tank. For instance, 44 ohms is a half a tank. You do not need the key on to do this. If you get a reading that is very high, chances are your problem is with the sender unit on the front of the gas tank. Measure that to ground and see what happens.

 

[sheetmetal]

ok John i checked the impedance and there was none. i guess my sending unit is at the least, some of the problem. my next question is , i have a tank with a gauge from a 71,will this be compatable. thanks for you help. i now this is not part of the problem but when i removed the fuse block my horn stopped working. which makes me think there is a grounding problem

 

[John_Muha]

I don't know how accurate the fuel gage would read because I don't know how you mounted the tank. The 71 sender has the same 0-88 ohm resistance as the 67. It should be close. Only odd ball is the 64.
Fix one thing at a time. Screw the fuse block back in. If your horn doesn't work it usually doesn't have anything to do with the fuse block unless you unplugged the firewall connector.

 

[sheetmetal]

looked today at the 71. its a top mount fuel unit ,the 67 is front mount so i have to get a different on thanks for the help.