Factory ammeters never work, why?

[weim55]

Originally Posted by ray_mcavoy

Yes, as 57taskforce said, one fuse is on the driver side of the radiator support near the voltage regulator. The other is over on the passenger side near the battery. The factory fuse holders take 4 amp SFE4 fuses and look like this:



The 64 - 66 trucks used the same exact ammeter circuit as 67 - 72. So when working properly, the behavior should be the same. However, 64 - 66 did not have the little 4 amp fuses protecting the meter movement and it's associated wiring. I've seen a few 64 - 66 wiring harnesses with melted ammeter wiring so I think adding the inline fuses to those years is a good idea.

Great information! I will dig in on my 69 at some point soon to see if the fuses are the issue. I too would greatly prefer a voltmeter but if the amateur would work as good as the one in my 65 I would be perfectly happy. I can always tell right away if the charging system is functioning properly.

Steve weim55 Colorado