Fiat Ducato Owner's Handbook Manual page 177

If the vehicle is inactive for a long pe-
riod of time, refer to the "Vehicle stor-
age" paragraph in section "Getting the
best out of you vehicle".
Before performing any operation on
the electrical system, disconnect the
battery negative cable.
Battery terminals shall always be
perfectly separated.
If you want to add accessories after
buying the vehicle (antitheft system,
free-hand phone kit, radio navigator,
etc.) visit a Fiat Dealership. They
can suggest the most suitable acces-
sories to get and check whether the
electric system can support the
required load or whether a higher
capacity battery is required.
These devices will, in fact, run off
the battery even when the key is not
inserted (vehicle parked, engine off).
176
VEHICLE MAINTENANCE
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The total intake of these systems
(factory and after-market) must be
less than 0.6 mA x Ah (of the bat-
tery) as shown in the following table:
Battery
100 Ah
manuals search engine
Maximum
admitted stand-by
intake
60 Ah 36 mA
88 Ah 52.8 mA
60 mA
Furthermore, remember that high in-
take electric devices (such as baby bot-
tle warmers, vacuum cleaners, cellular
phones, mini-fridges, etc.) powered
when the engine is off can deploy
the battery.
IMPORTANT When installing ad-
ditional systems on the vehicle, bear
in mind that improper branches on
connections of the vehicle wiring are
dangerous, particularly if safety devices
are involved.