Going back to basics, have you read the OM? I found that it offers a bit more than which knob to twiddle! Simple stuff but this is from the 2013 model OM that might offer a clue:
(battery symbol) illuminates red.
Illuminates when the ignition is
switched on and extinguishes shortly
after the engine starts. If it does not
illuminate, seek the assistance of a
Illuminates when the engine is
Stop vehicle and switch off engine.
Battery is not charging. Engine
cooling may be interrupted. The
brake servo unit may cease to be
To prevent the battery from becoming
discharged, the exterior lights turn off
automatically 10 minutes after the
ignition is switched off.
Battery discharge protection will not
work if the lights are turned on
10 minutes after the ignition has been
switched off; the key cannot be
removed from the ignition switch until
the battery is recharged.
Vehicles without stop-start system
will be equipped with a lead acid
battery. Vehicles with stop-start
system will be equipped with an AGM
battery which is not a lead acid
...Retrofitted electrical or electronic
accessories can place an additional
load on the battery or discharge the
battery. Seek the assistance of a
workshop regarding technical
possibilities, such as fitting a more
Ensure the ignition is switched off
before reconnecting the battery. Then
perform the following actions:
1. Set date and time in the
information display 3 76.
2. If necessary, activate the power
windows and sun roof 3 29, 3 31.
In order to prevent the battery from
discharging, some consumers such
as the courtesy lights automatically
switch off after a delay.
Charge a disconnected battery every
Battery discharge protection 3 113.
Replacing the battery
Any deviation from the instructions
given in this paragraph may lead to
a temporary deactivation of the stopstart
Only use batteries that allow the fuse
box to be mounted above the battery.
In vehicles with stop-start system,
ensure to have the AGM (Absorptive
Glass Mat) battery replaced with an
AGM battery again.
An AGM battery can be identified by
the label on the battery. We
recommend the use of an original
Using an AGM battery different from
the original Vauxhall battery might
result in a lower performance of the
Charging the battery
On vehicles with stop-start
system, ensure that the charging
potential does not exceed 14.6
volts when using a battery
charger. Otherwise the battery
might be damaged.
2015 2.2 CDTi SENav 163ps manual 4x4 in Carbon Flash with 19\" alloy spare towing a Bailey Unicorn III Madrid @ 1500kg.