It's not as useful, and harder to wire. To measure amperage, you either need a gauge in series with the main power feed, or an inductive pickup. It would tell you how much load was on the system, and it would tell you whether the battery was charging or discharging. You can infer these things by the voltage reading, so having both gives you very little additional information.

IIRC, the hole diameter is 1", or maybe 26mm.

I suspected that wiring would be less than straightforward.

Thank you for helping me to dispense with my ignorance and add to my knowledge.

If it flickers, the brushes are worn out, OR, the alternator itself is bad.

-Henry

__________________
1976 Mercedes-Benz 300D, Colorado Beige / Mahogany
www.hmclever.com

Splitting hair?

Or the light bulb filament is flaky.
Or the armature wire is flaky.
Or loose connection.
Or loose ground strap
These are other possibilities, do I need to list more?

__________________
Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.