Trouble-shooting table for electrical system
4
L / M . . / 07.96
Trouble-shooting at the battery
Malfunction
Battery not recharged
or insufficiently
recharged resp. goes
flat rapidly.
Indication
Terminal voltage drops
even a short time after
recharging to 7 V
despite a 12 V nominal
voltage (or 14 V if
nominal voltage is
24 V).
Cause
Poor connections,
open circuit or contact
resistance in charging
circuit, short-circuit in
line.
Battery defective, inter-
nal short-circuit.
Capacity of battery has
dropped severely, be-
cause it was heavily
discharged for a lengthy
period (greyish-white
cell plates = „sulphati-
sed“).
Battery poles connected
wrongly, destroying one
or more diodes in the
generator.
Charge current too weak
(esp. in winter).
Battery capacity is too
large.
Defective voltage regula-
tor (e.g. overheated /
overladed).
Loose V-belt at
generator.
Remedy
Eliminate the open
circuit, clean the termi-
nals, tighten terminals
if slack.
Renew battery.
Recharge battery at low
current (approx. 1/40 of
nominal capacity in
Amps) for about 50
hours. (This is only
possible if sulphate coa-
ting is not yet too
strong.)Otherwise:
renew the battery.
Repair generator
Recharge the battery.
Install a smaller battery
or a larger generator.
Renew the voltage
regulator.
Correct V-belt tension.
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