If the proof meter is working and the tach is not working then the cable and drive system is fine.... the proof is working. The problem is internal to the tach workings... so basically you have a junk tach. As far as the charging problems go.... that's pretty much normal for those systems. You gravitate between bad regulators and bad generators and back again until you have enough and install a Delco 10si alt. In your situation.... if you have an engine that was built after 1972 and it has the welch plug above the oil pump drive (just below the oil filter) and also has a factory spin on filter.... I'd just install the tach drive in that welch plug hole. You will need a new oil pump drive shaft/gear with the square drive hole, the angle drive, a new cable for a 5600 and an instrument cluster for a 5600. I'd probably go with a Tisco unit myself... Then install a Delco 10si alt from NAPA with a lifetime warranty. You need to modify the lower bracket and extend the length and carve the upper one. Wiring needs to be updated a bit but that is simple. Once done... it's DONE, and it charges. If you have an older block and require the tach drive to remain on the alt/gen... you can buy a modified Delco 10si for this specific purpose, from Tisco. This site retails Tisco stuff....
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