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#1
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Battery Drain: 1981 380SL
Greetings. I purchased a cherry '81 380SL last year. The vehicle has a trickle charger installed. Something drains the battery if not driven or charged. The battery can be depleted in a week. Yes, of course I have replaced the battery! Any tips on diagnosing this are welcomed and appreciated. Is this common? Thank you!!
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#2
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Be sure to post the solution to the problem.
With the engine and key off, place a screw driver / piece of steel on the pulley end / other end of the alternator. If you feel it being pulled to the alternator, a diode is likely conducting in both directions ( shorted ). Just be sure the screwdriver isn't magnetized as it will affect the test. A diode is a one way check valve for electricity, when it conducts in both directions the alternator windings remain energized draining the battery. Another test is to use an amp clamp to probe wires looking for a drain. An Amp Clamp is a generic term for a mater that clips around a wire and measures current flow. If you get one, just be sure it will read DC ( battery for example ) and the lower cost ones only read AC ( house power for example ). If you are tool limited, disconnect the battery then disconnect, insulate the alternator wires, then reconnect the battery and monitor battery voltage over time to see if there is still a draw. There are other methods of testing but these are quick when limited on tools. |
#3
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You will need a new regulator fitting in to the alternator . . Charge the battery up, and remove the plug to the alternator .You will see then if its the problem, next time you conect the battery up.
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#4
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__________________
Ron 2015 Porsche Cayman - Elizabeth 2011 Porsche Cayman - Bond,James Bond Sadly MERCEDESLESS - ALways LOOKING ! 99 E320 THE Queen Mary - SOLD 62 220b - Dolly - Finally my Finny! Sadly SOLD 72 450SL, Pearl-SOLD 16 F350 6.7 Diesel -THOR 19 BMW X5 - Heaven on Wheels 14 38HP John Deere 3038E Tractor -Mean Green 84 300SD, Benjamin -SOLD 71 220 - W115-Libby ( my first love) -SOLD 73 280 - W114 "Organspende" Rest in Peace 81 380 SL - Rest in Peace |
#5
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Quote:
Mercedes-Benz R107 Alternator Replacement and Inspection | 1972-1986 - 450SL, 380SL, 500SL, 560SL | Pelican Parts DIY Maintenance Article -Dmitry |
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