Generac Power Systems GN190H, Service And Repair Manual

Page: 30 / 62

28
b. Once stabilized, draw in the final sample.
c. Draw in only enough electrolyte to obtain a reading —
do not let the hydrometer float hit the suction bulb.
d. Hold the hydrometer vertically and shake it gently to
make sure the float is not sticking to the inside of the
glass barrel.
e. Read and record the specific gravity reading.
4. Check the temperature of the fluid. Add the required
points if temperature is above 80 F. Subtract the required
points if below 80 F (see Figure 6.3).
5. Check and record readings of the remaining cells in the
same manner.
6. When all cells have been checked, subtract the lowest
reading obtained from the highest reading. If there is more
than 30 points difference, the battery is probably defec-
tive and should be replaced.
In Figure 6.3, the highest reading is 1.260, and the lowest
reading is 1.225. Subtract 1.225 from 1.260 to obtain a 35
point difference.
GENER
A
C
SECTION 6: ELECTRIC STARTERS AND BATTERIES
Figure 6.3 — Using a Battery Hydrometer