TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 722 of 1275

3 Use black dipstick (5) to obtain a small sample of battery acid.

4 Place a few drops of acid onto measuring surface (3) through opening in cover plate.

5 Point instrument toward any light source (headlight) and look into eyepiece (6). The battery charge is at a point

on the left part of the scale where the dividing line between light and dark (shadow) crosses the scale.

NOTE

A little experience will enable you to quickly obtain the best contrast between light and

dark portions of the field of view. Tilt the instrument toward the light source until the

best results are obtained. If the edge of the shadow

surface was not sufficiently cleaned or dried.

is not sharp, the measuring

b. Removal

WARNING

• Battery gases can explode. Do not smoke or allow sparks or open flames near

batteries. Wear safety glasses or goggles when checking batteries. Failure to

follow this procedure could cause serious injury or death.

• When working on batteries, wear eye protection and remove all jewelry, dog tags,

and metal items to avoid electrical shock and bums.

CAUTION

When removing batteries, always disconnect ground leads first to prevent damage to

batteries.

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TM 9-2350-311-20-1