AC & Battery problems on '94 S-320

Tiny
STEVANDITTMER
  • MEMBER
  • 1994 MERCEDES BENZ S320
  • 6 CYL
  • 2WD
  • 220,000 MILES
Some of my AC diverters are not working properly. Supposedly actuator troubles. Eventually drains the battery dead.
Sunday, July 10th, 2011 AT 4:38 AM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
For parasitic drains, there are many possibilities and one of the most comon causes are bad/stuck relays.

You need to isolate the source of the parasitic drain circuit.

Disconnect the battery negative terminal and install an amp meter in series with it and note the amount of currect being drained after 3 minutes. Anything more than 0.005 amp is not good.

Start pulling fuses and any that results in the amperage dropping drastically is the circuit to look at.

Install a amp meter between the battery negatic=
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Sunday, July 10th, 2011 AT 6:00 AM

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