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CTek charger - eyelet connectors

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25 Jul 2020 09:49 #225611 by Antman84
Hi all
Complete noob question so sorry in advance.

I have a 2020 Jimny and a CTek trickle charger.

The charger comes with clamps for temporary connecting and ring/eyelet connectors that will permanently fix to the battery and allow for easy connecting to the charger.

I can see how I can affix the positive eyelet of the CTek connector to the positive terminal on the battery. However I need to find a suitable earthing point close to the battery for the negative eyelet.

I have no idea where or how to do this.

Does anyone have any tips?

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25 Jul 2020 10:30 #225617 by CC Baxter
I've got a similar setup on a motorbike. Nothing wrong with the negative terminal on the battery. Chris

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25 Jul 2020 10:39 #225618 by Antman84
Really? That’s good to know.
The only thing I’m concerned about is the CTek tutorial video on YouTube (
) explicitly says “the earth or ground terminal must be connected to a suitable point on the vehicle body work”.

That is to say, not the battery's negative terminal.

As I said I am a noob to both Jimny and have never used a trickle charger in my life and don’t want to stuff it up

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25 Jul 2020 10:45 - 25 Jul 2020 10:47 #225619 by CC Baxter
All earths run to the same point, if you connect to a suitable nearby point what's the difference? Fuse protect the positive side (the connector should have a fuse built in) and you're good to go. Chris
Last edit: 25 Jul 2020 10:47 by CC Baxter. Reason: Mistooks
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25 Jul 2020 10:51 #225621 by Antman84
Thanks Chris

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25 Jul 2020 10:53 #225622 by Roger Fairclough
Sounds odd to me especially as the demonstrator is using a battery on a bench and is connecting directly to that battery! Maybe he is worried that someone may connect to the plastic covers on the terminals and not actually to the terminals themselves.I do wish that if a demonstrator is showing something that would appear odd to people who are technically in the know that they would explain why.

Roger

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25 Jul 2020 10:59 #225623 by Antman84
Yeah he does say that for the bench demo he will use the negative terminal but does state clearly you use an earth / ground point when the battery is in a car.
Watch from 30sec to 60sec mark in the video.

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25 Jul 2020 11:11 #225625 by mlines
We use cTek in the boat and have done for many years. Left on all winter to manage the batteries. Boat is fiberglass so no concept of body earth, we have the eyelets connected to the boats charging VSR and it's fine.

Sent from my Pixel 2 XL using Tapatalk

Martin

2003 M13 early KAP build.
3" Trailmaster lift with 1.5 Spacers on front
Customised winch bumper and roll cage
235/85R16 Maxxis Bighorns on 16" Rims, 4:1 Rocklobster, Rear ARB locker and on-board air
Corrected arms all-round, rear disks, Recaro seats and harnesses
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25 Jul 2020 11:22 - 25 Jul 2020 11:23 #225626 by Scimike
As Chris said.
I will second that electrically it makes no difference, the battery -ve terminal and body earth points on the Jimny are at the same potential.

I guess they are trying to keep any possible arching sparks that may occur when connecting away from the battery terminals, and any vented gas, as they also say connect the -ve body clamp last. This puts the potential spark area away from the battery. Just a guess on my part.

Over cautious world's in which we live maybe.

Mike
Last edit: 25 Jul 2020 11:23 by Scimike.
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25 Jul 2020 11:30 #225627 by Antman84
Thanks all. Seems likely I’m over-thinking this :)

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25 Jul 2020 21:58 #225654 by RainerK
I would connect it directly to battery, at the M10 nut.

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26 Jul 2020 07:48 #225673 by Grim Reaper
The reason for choosing a chassis earth rather than battery post is probably more to do with modern car electronics over spark mitigation.
With a lot of cars nowadays having start/stop and smart alternator technology, they generally have some form of shunt on the battery earth connection which allows the ECU to monitor the amount of charge in the battery to allow for dumping charge into the battery on regen when going downhill.
If you were to charge the battery bypassing this shunt, the ECU would be unaware of the recharge, so it is best to connect to the chassis side of the shunt so that any external charging from a battery charger is able to be seen by the ECU and taken into account when the car is started following the charging. Have a look for a small OEM wire connection off the negative terminal to check whether it is fitted with a current monitoring shunt, if it has, then I advise not connecting direct to the battery terminal but to the chassis side of the shunt instead.
Modern vehicle electrical systems are a real pain, my VW Transporter needs to be reprogrammed with battery type and capacity if the battery is ever changed so the charging system can work out the best way to use its capacity and monitor/adjust the way it charges the battery as it degrades over time.
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