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Chassis earth point for battery maintenanceViews : 2201 Replies : 7Users Viewing This Thread : |
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Apr 6th, 2020, 21:07 | #1 |
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Chassis earth point for battery maintenance
I have to connect my maintenance battery charger (CTEK) to my wifes 2017 V40 T2 automatic. I understand all the methods etc but what I need help with is:
The manual talks of the negative earth to chassis being made by the right hand engine mount but unhelpfully the diagram doesn't show the location that it recommends. Looking under the bonnet there is on the left hand side adjacent to the battery housing a welded, but painted, bracket fitted to the chassis. This doesnt appear to have any function other than maybe as the chassis earth for battery charging/maintenance. It has what I think is an earth lead from elsewhere on the car which is fixed, with an eye and bolt, to the chassis adjacent to this bracket. Maybe the manuals havent been updated to match the later design? Question is. Is it the proper earth point and if not where would you use as an earth point. Sorry to be a Jimmy Green about this but I am aware that incorrect connections can cause havoc with modern car electronics. Thanks in advance
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Apr 6th, 2020, 21:44 | #2 |
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Any chassis earth point should be suitable. Paint can affect the connection, so an exposed chassis bolt or bracket etc would be preferable. The most important thing to remember with CTEK or similar chargers is to make sure you have the charger connected to the vehicle before you switch on the power.
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Apr 6th, 2020, 23:40 | #3 |
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I've never understood why it's not recommended to simply use the + and - terminals on the battery itself. Can you enlighten me, please?
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Apr 7th, 2020, 08:03 | #4 | |
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Quote:
I attach the charger negative croc to one of the EGR valve bolts (connecting to the engine is just as good as connecting to the body).
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Apr 7th, 2020, 08:48 | #5 | |
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Hi
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Just wondering Iain |
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Apr 7th, 2020, 09:06 | #6 |
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That particular sensor couldn't know, but the BMS (battery monitoring system) could easily have an input telling it, for example, that the doors were locked. I'm not sure why it would need to though... what were you thinking?
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Apr 7th, 2020, 09:19 | #7 | |
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Quote:
Acording to VIDA, the car has to be left parked with doors locked for 6 - 8 hours to allow the BMS to recalibrate in those circumstances. I know, because it happened to me after the Volvo dealer tech connected the battery maintainer to the battery negative, contrary to VIDA instructions, during a service. |
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Apr 7th, 2020, 16:03 | #8 | |
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Quote:
You can also monitor the momentary battery drain when engine is off. Just sitting in the car and listening to music with ignition off consumes 5-7 amps. That's quite a lot, tbh. With ignition on, car electronics draws even more - 15-18 amps from battery. |
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