66Dartdriver
Well-Known Member
ok purchased this 1965 dart about two months ago. the fuel gauge would only show 5/8 when full. I read a bunch of posts on here and read to ground the sending unit wire to the frame and if it registered as full on the gauge the sending unit is bad and the gauge is ok. installed new sending unit and same thing. so read some more and decided to remove the internal regulator/limiter and replace with a 5v "7805" replacement. see pic. reinstalled the gauges back in the dash turned on the key and the fuel gauge went only to 1/8 with a full tank? wth? pulled the gauges back out bench tested the gauge with the "old sending unit and it worked great, full, half and empty tank positions on the sending unit rheostat.
i figured it was a ground problem on the tank sending unit. tried an external ground strap to the frame nothing...tried a ground strap all the way to the neg term on the battery still nothing. any suggestions or what to look at next??
thanks!
i figured it was a ground problem on the tank sending unit. tried an external ground strap to the frame nothing...tried a ground strap all the way to the neg term on the battery still nothing. any suggestions or what to look at next??
thanks!