Ford TRANSIT 2016.75 Mounting Manual page 116

Convert Fit Additional Third Party
Batteries
If additional batteries are added, a disconnect relay
or main manual switch system is advised to isolate
the converter fit battery from the Ford fit batteries.
It is recommended to only connect the third party
battery to Ford fit batteries and alternator at
engine Run. The third party battery should be
connected to the auxiliary battery side of the
system via the customer connection points or the
Ford Programmable Battery Guard (A540) for the
+12V supply. If the third party battery and added
system requirements exceed 180A of current,
connection to the battery positive 6mm stud is
permissible, as detailed in the 'Third Party +12V
Power Take Off for Loads Exceeding 180A' section
of this manual. This ensures the vehicle start
battery is untouched. If supplemental chargers are
added for the third party converter fit battery,
direct connection of such chargers to this battery
is required. Connection to the auxiliary battery also
reduces the number of crank micro cycling that a
third party battery will be exposed to on a
Start-Stop variant. This is because the starter
motor in an auto start condition, only uses energy
from the vehicle start battery, the rest of the power
supply is isolated until the engine is running. Gel
batteries in particular are vulnerable to multiple
starter cycles, see next figure E225363 for an
example of converter fit third party battery
installation to existing Ford power supply
architecture.
116
Date of Publication: 03/2018
The Charge can also be applied to the Ford fit
batteries, all relays/switches connected, but only
for an emergency charge.
When changing from an incompatible battery
configuration to a compatible system, Start-Stop
and SRC functionality will take some time (ignition
off overnight and multiple ignition run cycles) to
re-establish full functionality.
Refer to: 4.3 Charging System (page 103).
System Operation
FORD TRANSIT 2016.75 EU