SL/R230: Bose amplifier draining the aux battery?
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From: NJ
05 SL65, 05 CL65, & 08 CLK63
Bose amplifier draining the aux battery?
Realized I had a 4.5 amp draw at rest that seems to have been coming from fuse 66 (bose amp / sounds system) & fuse 76 (phone). After leaving both fuses out I still have a small .8 amp draw, it seems like fuse 66 was the main culprit. Is the .8 amp draw at rest normal for the r230s ? Also the stereo did seem to malfunction prior to having this issue with the battery getting drained, is this pretty common? Thanks
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From: NJ
05 SL65, 05 CL65, & 08 CLK63
BTW my car is an 05 SL65 with 20k miles, I was planning on upgrading the stereo with a new double din, amp, etc. So not too concerned about fixing the amp or head unit that malfunctioned.
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2005 R 230 SL350 (M112 3.7). Sold the 1966 W113 230SL recently
50-65 mA was quoted as the normal draw in sleeping mode (which starts after approx 22 minutes). So 800 mA is still out of range.
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Carefully pass test leads out of trunk across seal, and close trunk and lock car as normal, then wait.
800mA is a lot and will flatten a good battery in a few days.
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From: NJ
05 SL65, 05 CL65, & 08 CLK63
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2005 R 230 SL350 (M112 3.7). Sold the 1966 W113 230SL recently
What you describe is putting your multimeter in series with the electric circuit. Touching the terminal, like that, to the best of my knowledge would be a wake up sign via canbus. No situation for measuring sleep mode draw.
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I would have to try to clip it on the terminal & wait for it to go to sleep. Hopefully it can enter sleep mode with trunk open
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To fully enter sleep mode, when measuring parasitic drain, you need to lock the car. You cant do that with the trunk open.
However you may get the results you are looking for, as all you are waiting for is the Amplifier to go into sleep mode, which it should do shortly after the head unit is turned off.
Measuring parasitic drain at the battery terminal is not very helpful, as you can not be sure what is causing it.
Better to do it at the fuses, using a amp-meter that connects directly to the fuse terminals.
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Joined: Dec 2018
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From: NJ
05 SL65, 05 CL65, & 08 CLK63
To fully enter sleep mode, when measuring parasitic drain, you need to lock the car. You cant do that with the trunk open.
However you may get the results you are looking for, as all you are waiting for is the Amplifier to go into sleep mode, which it should do shortly after the head unit is turned off.
Measuring parasitic drain at the battery terminal is not very helpful, as you can not be sure what is causing it.
Better to do it at the fuses, using a amp-meter that connects directly to the fuse terminals.
However you may get the results you are looking for, as all you are waiting for is the Amplifier to go into sleep mode, which it should do shortly after the head unit is turned off.
Measuring parasitic drain at the battery terminal is not very helpful, as you can not be sure what is causing it.
Better to do it at the fuses, using a amp-meter that connects directly to the fuse terminals.
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Posts: 469
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From: North West England
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