What Causes Auxiliary Battery Malfunction In a Mercedes

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What Causes Auxiliary Battery Malfunction In A
Mercedes?
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It is unsafe to drive a Mercedes that displays
"Auxiliary Battery Malfunction".
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Why so, you asked?
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This message simply means that your Mercedes
auxiliary battery has some faults.
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If you don't do anything to get rid of this
message, you can put yourself in trouble.
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But, dont worry
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We will help you find and fix the culprit behind
this message.
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But first, let's discuss what is an auxiliary
battery.
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Auxiliary Battery - Why Does Your Mercedes Need
It?
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You can think of it as a backup to the main
battery.
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Depending on the make and model of the vehicle,
an auxiliary battery can power-

• Engine start-stop system
• Infotainment system
• Other electrical appliance

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If for some reason, it goes bad, your Mercedes
will display the-

• Auxiliary Battery Malfunction message on its
  dash.

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What Causes Auxiliary Battery Malfunction In
Mercedes?
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Battery is old
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Batteries are not designed to last forever.
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They wear out over time due to chemical corrosion
and some other reasons.
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And, if you don't replace the auxiliary battery
of your Mercedes after it has worn out-

• Auxiliary Battery Malfunction message may
  appear.

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Faulty main battery
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An auxiliary battery is nothing but a backup to
the main battery.
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If the main battery malfunctions, it will put
excess stress on the auxiliary battery.
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And, guess what, if you dont install a new
primary battery on time-

• Auxiliary Battery Malfunction message may
  appear.

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Bad charging system
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An auxiliary battery doesnt generate electricity.
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It simply stores the energy generated by the
charging system of the vehicle.
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If for some reason, the charging system of your
Mercedes goes bad, it may display-

• If for some reason, the charging system of your
  Mercedes goes bad, it may display-

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Sum Up
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An auxiliary battery is as important as the
primary battery of a vehicle.
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If for some reason, it malfunctions, you will
encounter several problems.
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So, if your Mercedes displays an "Auxiliary
Battery Malfunction" message, don't ignore it.
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