Opel 1900 1973, Service Manual, Page: 29 / 625

8 1873 OPEL SERVICE MANUAL
ELECTROLYTE SPECIFIC GRAVITY
TEMPERATURE C O R R E C T I O N
THERMOMETER 30”
EXAMPLE A: EXAMPLE
TEMPERATURE = 120”
TEMPERATURE =
HYDROMETER
READING READING
TRUE SPECIFIC
GRAVITY
Figure Specific Gravity Temperature Correction
S c a l e
When using a hydrometer, the following
1. Hydrometer must be clean, inside and out, to in-
sure an accurate reading.
2. Hydrometer readings must never be taken im-
mediately after water has
been added. The
must be thoroughly mixed with the electrolyte by
charging for at least 30 minutes before hydrometer
values are reliable.
3. If hydrometer has built-in thermometer, draw liq
into it several times to insure correct temperature
before taking a reading.
4. Hold hydrometer vertically and draw in just
enough liquid from battery cell so that float is
floating, and with bulb fully released. Hold
at eye level so that float is vertical and free
outer tube, then take reading at surface of liquid.
Disregard the where the liquid
against float stem due to surface tension.
5. Avoid dropping liquid on car or clothing as it is
extremely corrosive. Any liquid that drops should be
washed off immediately with soda solution.
FUSIBLE LINKS
All 1973 Opel Models have fusible links located be-
tween the starting motor post and the generator
regulator. These links are the weakest point in the
electrical supply system for the complete car, and, as
such, will act like a fuse for every wiring harness in
the
Every electrical accessory is still protected
by a fuse or circuit breaker, of course, but fusible
links protect the wiring harnesses
before
the fuses.
A fusible link consists of soldering a smaller gauge
wire to a heavier gauge wire end to end. In the event
of a circuit overload where the heavier gauge
becomes short circuited, the fusible link or smaller
gauge wire will burn out first, thus, protecting its
circuit from major damage. These fusible links are
located in the engine compartment in such a manner
that if overheated, the possibility of a fire is very
The attachment of the fusible links and the circuits
they protect are as follows: See Figure
F L
T E R M I N A L
SOLENOID ON STARTER
Figure Fusible Links
Fusible link (1) is connected to the starter solenoid
at the battery cable terminal, on one end and to the
red and white stripped main feed wire at the other
end.
Fusible link (2) is connected between the red wire
terminal of
the voltage
and protects
against a situation where the battery will not accept
a charge and the generator is charging to handle
various electrical loads. Fusible link (3) is connected
between the light blue with white stripes wire and D