Ammeter fiber washers worn and burned.

[Fernando Mendes]

Look out for it can be very dangerous and cause fire.Yesterday I burned my finger after touch the ammeter terminal.Check yours.

[MBF]

Sorry to hear that Fernando.  If your truck is wired as original, everything is routed through the ammeter.  If you've added heavy amp draw accessories you may want to wire them individually with their own breaker.  If you haven't added anything, it sounds like you've got a lot of resistance (bad ground?) in one or more of your circuits to cause it to overheat.   Mike

[TodFitch]

On my older car there are a number of circuits on the back of the ammeter that are simply metal strips that have riveted connections. Over the decades those rivets loosened some and created bad connections with lots of heat. Enough heat to melt the solder on the Buss fuse that mounts to the back of the ammeter in my case (they moved the fuse later). A through cleaning of the connections and rivets followed by soldering them and I haven't had a problem in the 30 years since.

 

I don't know how the back connections and circuits are on that vintage truck but if it has riveted connections you might want to verify that they are in good electrical order.

[Fernando Mendes]

Yes guys that was a bad ground.The left hand side ammeter terminal was loose.The fiber washer was all toasted.Thanks for your input.