also true of burned on terminals, and in either case,
the connections should be drilled off, cleaned and re-burned.

Terminals sometimes become so badly corroded that it is impossible to
disconnect the cables front the battery. Stitch terminals should be
drilled off and soaked in boiling soda water.

ELECTROLYTE TROUBLES

(1) Low Gravity. See page 321.

(2) High Gravity. See page 323.

(3) Low Level. See page 323.

(4) High Level. This condition is due to the addition of too much
water. It leads to corrosion as already explained. It also causes a
loss of acid. The Electrolyte which overflows is lost, this of course,
causing a loss of acid. The condition of Low Gravity then arises, as
described on page 321.

(5) Specific gravity will not rise during charge. See page 204.

(6) Milky Electrolyte:

(a) Lead Sulphate in Battery Acid. It sometimes happens that sulphuric
acid contains some lead sulphate in solution. This sulphate is
precipitated when water is added to the acid in mixing electrolyte,
and gives the electrolyte a milky appearance. This sulphate settles if
the electrolyte is allowed to stand.

(b) Gassing. The most common cause of the milky appearance, however,
is the presence of minute gas bubbles in large quantities. These may
be the result of local action caused by the presence of metallic
impurities in the battery. The local action will stop when the battery
is put on charge, but will begin as soon as the battery is taken off
charge. The impurities are gradually covered by lead or lead sulphate,
and the local action is thus stopped.

Excessive gassing in a cell which contains no impurities may also
cause the electrolyte to have a milky appearance. The gas bubbles are
very numerous and make the electrolyte look milky white.

(c) Impurities in the electrolyte will also give it a milky appearance.

GENERAL TROUBLES

Open Circuits

1. Poor Burning of Connectors to Posts. Unless a good burned
connection is made between each connector and post, the joint may melt
under high discharge rates, or it may offer so much resistance to the
passage of current that the starting motor cannot operate. Sometimes
the post is not burned to the connector at all, although the latter is
well finished off on top. Under such conditions the battery may
operate for a time, due to frictional contact between the post and
connector, but the parts may become oxidized or sulphated, or
vibration may break the conne