What are these parts on my firewall?

[rechinca]

The factory battery gauge is an Ammeter gauge not a Voltage gauge. It reads charge/discharge arrangement so you will not see a reading like a volt style one reads. There is a member in Oregon who sells a conversion kit to make it into a volt reader.

[Steeveedee]

Look at your harness for the fuses for the charging system. It only takes one to be blown for the gauge to not indicate charge//discharge.

[Thundarr]

Steeveedee,
Are you referring to "inline" fuses along the wiring harness in the engine bay?
Not on the fuse block?

I replaced a few that I found years ago that were blown but I need to go see if I can find any others.

[Stocker]

This is what you're looking for. There are two in the engine compartment near the front of the truck-- one on the right side near the battery, and one on the left side.

[stsalvage]

battery voltage gauge on all cars and trucks Leave them alone or disconnect them. seen more cars and trucks catch fire due to the Voltage gauge. There a fire just waiting to happen. Trust me If you're having a voltage problem you don't need a gauge to tell you your wipers will be slow your lights will be dim your starter will drag. If your not into car's or trucks by the time you get into these old trucks Best off stay with New car's and trucks.

In my 1960 and my 1966 bobtails, I drove while hauling trusses for new housing back in the 80's here in Calif My boss unplugged the voltage gauge wires to are gauges. I found out when I got my own 1965 3/4ton. Rules of driving these trucks Never drive an old truck with old wires connected to the Voltage gauge. If you like your classic car or truck I forewarn you Unplug or tape up the wires you don't need them.

[stsalvage]

Originally Posted by Stocker

This is what you're looking for. There are two in the engine compartment near the front of the truck-- one on the right side near the battery, and one on the left side.

The fuse is for the side blinker for the 1971-72 chevy trucks It's not for the voltage gauge

[stsalvage]

I'm hoping to install something like this on the Rear side markers that don't blink while you making a right or left hand turn

[Stocker]

Originally Posted by stsalvage

The fuse is for the side blinker for the 1971-72 chevy trucks It's not for the voltage gauge

My K20 has an ammeter, not a voltage gauge.... and it has the two 4A fuses for the ammeter. If either fuse fails, the ammeter won't work.

Reference this thread for more info & clarification, in particular post #2 and post #4 by VetteVet. http://67-72chevytrucks.com/vboard/s...d.php?t=714782