Car Batteries
Mercedes-Benz 300-Series

What could be causing the battery to drain on your 1982 Mercedes 300 SD?


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2006-07-24 13:06:44
2006-07-24 13:06:44

could be alot of things,take a volrt meter and with the key off test each fuse to see if its letting juice over a few volts thru it, will isolate the problem, hope that helps

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Related Questions

The key being in the "on" position itself. As for rapid battery drain, you could have a bad battery or there could be a loose connector. Source: Personal experience

Dead cell in the battery itself which requires you replace the battery. Can also be any light on the vehicle that is on pulling power from the battery. It can also be a relay that is stuck closed.

something is causing a drain on the battery when switch is turned off

If the alternator is installed incorrectly, yes, it can drain the battery.

If the defect is causing a parasitic drain, yes.

Absolutely. If a diode shorts to ground it can drain a battery in a very short time.

another clog, further down the drain pipe. You need a drain snake.

If the battery is worn out it may not hold a charge for 8 hours. There could also be a short somewhere causing the battery to drain down.

A dead cell in the battery will cause it to loose it's charge overnight. The only fix is to replace the battery. Any light that is staying on will drain the battery. Also a stuck relay will drain the battery.

most likely somehting is not turning off such as an interior light that has a broken switch or you could have an electrical short somehwere.

you could have a short some where causing it to drain the battery. or the hatch or doors are not shut keeping the lights on in the car.

Something is causing a drain on the battery even with the vehicle off and nothing turned on. A good mechanic can do a drain test on the battery to see what may be draining the charge. A dead cell in the battery itself will also cause the battery to go dead. Disconnect the negative battery cable overnight and if the battery is dead the next morning it has a dead cell and must be replaced. If not look for a light that is on or a relay that is stuck.

No, a bad coil will not drain the battery.

there is a short some where in the electrical system... or a bad battery.

Could be a bad voltage regulator or Connect a test light in series with - battery cable Remove fuses one at a time until light goes out - that will tell which circuit has current flow, then check that circuit for defect

Dead cell in the battery or something is on pulling power from the battery. If it is a dead cell the battery must be replaced.

Dead cell in the battery which requires a new battery. Something can be on drawing power from the battery. Under-hood, glove box, trunk, dome light, etc. A relay that is stuck will also drain the battery.

you most likely have aparasitic drain which is causing your battery to discharge, depending on what is causing the problem, was anything added recently say a new radio spliced into another wire. take a look at any visible wires that are not sealed properly, or your battery needs a good cleaning with baking soda that could cause a drain on the batt which would need to be removed as the acid from the battery could cause other potential problems also clean the ends of the cables for an easier start during the winter months while your at it.

no , only the concrete and other cemented floors ....

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