Sponsored Links (Register now to hide all advertisements)
Most of the meters just need to have the cover removed, then use a toothpick and carefully put a drop of heavy oil on each of the two pivots for the needle.
If you take the amp meter completely apart, make sure the magnet goes back the same way it came out. The heavy wire ring is the magnet, and if you suspend it by a thread one side will point north.
Some people solder the studs to the buss bar for a foolproof connection inside the ammeter, but the main thing is to be sure the connections are clean and tight. I made a special wrench to tighten the nuts on the back of the original ammeter. ALL connections must be clean and tight.
If you suspect a bad meter, connect a volt meter across the two terminal box wing nuts. If the terminal box nuts are tight and the 2 wires going to the ammeter are good, and the meter is good, then you should show less than .1 volts. To make this measurement you need current flowing, so turn the engine off and the lights on. Now, what does the voltage read across the 2 terminal box wing nuts? Also, what does the ammeter read?