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Z4 - E89 Battery Charging

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W00dl34Z4 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote W00dl34Z4 Quote  Post ReplyReply Direct Link To This Post Topic: Z4 - E89 Battery Charging
    Posted: 23 Nov 2023 at 2:27pm
I am now the proud owner of a CTEK MX5 battery charger. I would like to connect the eyelets with cable (supplied with the charger), directly to the battery rather than using the terminal posts in the engine compartment (cable and connectors also supplied). The Z4 handbook is not helpful and advice received so far is confusing.
What is the correct method of connecting the charger that will preserve the integrity of the car - at the battery in the boot, or at the terminal posts in the engine compartment.

I look forward to your considered advice...

Thanks
Woodlea34Z4
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Tony View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony Quote  Post ReplyReply Direct Link To This Post Posted: 24 Nov 2023 at 9:19am
Whilst the CTEK shouldn't cause the same sort of load as a jump start, I believe the directions to use the under-bonnet connections is because they allow the car's battery management & electronic protections systems to prevent damage to the battery or vulnerable modules.
2006 Z4MC
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W00dl34Z4 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote W00dl34Z4 Quote  Post ReplyReply Direct Link To This Post Posted: 24 Nov 2023 at 11:33am
Tony

I am indebted to you for your reply and will follow your advice. I understand the logic supporting your advice. The only problem I now have is that non the 35iS the '+' post is not that close to the '-' post but that is a trivial matter and I am sure I can find a suitable earth slightly nearer to the '+' post.

Best wishes, Martin
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Mike Fishwick View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike Fishwick Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 2023 at 11:00am
As the jump start connections are, electrically speaking simply an extension of the battery terminals, why not connect a Hella/BMW-type of socket directly to the battery via a fuse?  This would be easier to connect than messing around under the bonnet.

Also, have you thought about using the cigar lighter with a suitable plug?  CTEK should be able to confirm the process for avoiding the canbus system from shutting it down the cigar lighter after the
igition is turned off

I am not familiar with modern BMWs, but if your car has a battery monitoring system, use of the cigar lighter should be able to pass current through the sensor.


Edited by Mike Fishwick - 26 Nov 2023 at 12:28pm
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NickDE View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote NickDE Quote  Post ReplyReply Direct Link To This Post Posted: 26 Nov 2023 at 4:22pm
On my E30 and E46 I connected the CTEK connector wire with the eyelets to the battery connectors - you can usually slip them over the bolts that clamp the terminals onto the battery so quick and simple. For the E46 the plug end of the cable then pokes out of the battery compartment cover. The CTEK then lives safely in the boot with the extension lead squeezed by the boot seal, so safe and secure.
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Tony View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tony Quote  Post ReplyReply Direct Link To This Post Posted: 27 Nov 2023 at 5:36pm
That's why I said it's to protect the electronics in the charging system, as newer vehicles are more susceptible to being charged/jump-started incorrectly.




Edited by Tony - 27 Nov 2023 at 5:39pm
2006 Z4MC
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