Hi there guys,
The battery on my car (CLK320 W208), is getting drained after 5/6 days parked up unused. It jump starts and charges up fine, so I doubt I have an alternator problem, on tick over the battery reads about 13.98V, once fully charged the battery reads 12.27V.
Today I attached my multi-meter and pulled all of the fuses in turn to see if I could discover what if anything is drawing power from the battery. I opened the boot and switched off the boot light, I then opened the drivers door and switched off the interior lights and opened the bonnet.
I then left the car for about ten minutes and took a battery reading which was 12.26V - 12.27V (it was oscillating between the two). I have now pulled every fuse that I can find (boot, drivers side dash and engine bay) and there was no fuse that I could find causing a voltage drain on the battery. However during this process which took me maybe 15 minutes, the voltage of the battery dropped from 12.27V to 12.25V.
As an afterthought, I have also disconnected the battery earth and the reading is now 12.23V, but 12.22V with the earth lead reconnected (probably should have done this first). So this suggests to me that there is a drain of 0.01V, if this is significant
The battery was already installed when I bought the car and the dealer said it was a new battery. The makers name on the battery is Forenbuhl, which I have never heard of and is possibly the crappiest/cheapest battery the dealer could find
The battery on my car (CLK320 W208), is getting drained after 5/6 days parked up unused. It jump starts and charges up fine, so I doubt I have an alternator problem, on tick over the battery reads about 13.98V, once fully charged the battery reads 12.27V.
Today I attached my multi-meter and pulled all of the fuses in turn to see if I could discover what if anything is drawing power from the battery. I opened the boot and switched off the boot light, I then opened the drivers door and switched off the interior lights and opened the bonnet.
I then left the car for about ten minutes and took a battery reading which was 12.26V - 12.27V (it was oscillating between the two). I have now pulled every fuse that I can find (boot, drivers side dash and engine bay) and there was no fuse that I could find causing a voltage drain on the battery. However during this process which took me maybe 15 minutes, the voltage of the battery dropped from 12.27V to 12.25V.
As an afterthought, I have also disconnected the battery earth and the reading is now 12.23V, but 12.22V with the earth lead reconnected (probably should have done this first). So this suggests to me that there is a drain of 0.01V, if this is significant
The battery was already installed when I bought the car and the dealer said it was a new battery. The makers name on the battery is Forenbuhl, which I have never heard of and is possibly the crappiest/cheapest battery the dealer could find