62
Aerometer-type hydrometer
Optical-type hydrometer
Note. An optical-type hydrometer is thermally compen-
sated.
The various battery cells should display relatively even
values. Uneven results may mean that the battery is
more or less ready for replacement.
Electronics terminal box with semi-automatic fuses
Checking batteries and electrical
connections
Read the section entitled “Electrical system –
Important” on the previous page.
The service life of your batteries depends largely on
how they are maintained. Keep batteries dry and clean.
Dirt on the batteries may cause tracking and discharge
them, particularly in damp weather.
Clean the battery terminals and connections using suit-
able wire brushes. Poor contact may cause unneces-
sary voltage drops. Tighten the cable terminals well and
spray the battery terminals and connections with anti-
corrosive agent or coat them with Vaseline.
NOTE! Always stop the engine and break the
current using the main switches before work-
ing on the electrical system.
Also read the section entitled “Electrical sys-
tem – Important” on the previous page.
Resetting semi-automatic fuses
Semi-automatic fuses
The semi-automatic fuses are reset by pressing the re-
spective fuse’s button.
Maintenance – Electrical System
Check that the batteries are connected properly.
Also check that all other electrical connections are dry
and free of oxidation and that there are no loose con-
nections. If necessary, spray these connections with a
water-repellent spray (Volvo Penta Universal oil).
Charge condition
Check the batteries’ charge condition using a hydrome-
ter. The battery electrolytic density should be 1.28
g/cm
3
.* Charge battery if reading has dropped to 1.24 g/
cm
3
* (approx. 75% charge).
Note. If an aerometer-type hydrometer (see figure) is
used, the value read off applies at a temperature of ap-
prox. +25°C (77°F). At other temperatures the reading
must be compensated as follows:
at –20°C (–4°F)
compensate by –0.03
at –5°C ( 23 °F)
compensate by –0,02
at +10°C (50°F)
compensate by –0.01
at +40°C (104°F) compensate by +0.01
Example: A value of 1.24 measured at –5°C (23°F)
should be corrected to 1.22, and means extra charging
is needed.
* Note: For batteries with tropical acid substitute 1.24 g/cm
3
,
and 1.20 g/cm
3
.
Cleaning the battery terminals
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