TROUBLESHOOTING TABLE (cont)

TM 10-3930-638-10

3-5. TROUBLESHOOTING TABLE (cont)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. ENGINE WILL NOT CRANK (cont)

Lower tow bar, open grille, and remove battery cover as described in step 3 above.

Step 5.

WARNING

Battery electrolyte is toxic and corrosive. Use protective goggles and gloves when performing the

following. Avoid contact with skin, eyes, clothes, and don't breathe vapors.

Using a hydrometer and thermometer, check specific gravity of battery electrolyte in each cell.

Refer to following figure:

To determine charge of a battery, hydrometer readings must be corrected to a temperature of

80 degrees F. The normal correction is 4 points (0.004) of gravity for each 10 degrees change in

temperature above or below 80 degrees. Example: If the specific gravity reading is 1,280 at zero

degree F, subtract 0.032 as shown in the figure below. The corrected reading in this case

is 1,248.

Notify organizational maintenance if a corrected specific gravity reading of less than 1.225 is

obtained (battery must be recharged) or if specific gravity reading between cells differs by more

than 25 points (0.025) (battery must be replaced).

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