Group 30: Electrical system Repair instructions
15
Checking battery voltage
Special tools: Multimeter 9812519
General
If battery voltage falls below 12.4 V*, the starter motor
will not be able to crank the engine at normal speed.
A fully charged battery has an open circuit voltage of
about 12.7 V (depended of ambient temperature).
When the open circuit voltage falls to 12.5 V, the bat-
tery is half charged.
* Note. Measured on the batteries.
Voltage measurement, check
1
Check that the battery voltage is at least 12.4 V*
when unloaded by using multimeter 9812519 to mea-
sure between the battery poles.
* Note. Measured on the batteries.
2
Turn the main switch on.
3
Check that the voltage between terminals B+ and B– on
the starter motor are the same as the battery voltage.
Electric welding
Remove the positive and negative cables from the
batteries. Then disconnect all cables connected to the
alternator starter motor ,MDI.
Always connect the welder earth clamp to the compo-
nent to be welded, and as close as possible to the
weld site. The clamp must never be connected to the
engine or in such a way that current can pass through
a bearing.
WARNING! After welding is finished ,the wires
to the alternator must be reconnected before
the battery cables are reconnected.
Starter motor
Fault tracing the starter motor should be left to an au-
thorized electrical workshop which has the necessary
test equipment.
https://www.boat-manuals.com/
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