battery parasitic drain

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Re: battery parasitic drain

Postby Tuga2112 » Tue 13.09.2022, 08:39

i would need to check mine again. but the figures 16mah and 18mah come to mind when trying to recall my last results.

right now im also having parasitic drain issues. my battery was completely drained in 2 days. but i suspect the boot light was on.
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Re: battery parasitic drain

Postby Rambo » Tue 13.09.2022, 21:05

Easy to verify that Jõao. Stick your phone on video mode and close the boot.

PS make sure you don't leave your key in the boot though :lol:
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Re: battery parasitic drain

Postby Tuga2112 » Tue 13.09.2022, 22:10

Rambo wrote:PS make sure you don't leave your key in the boot though :lol:

I Have my own solution to that installed. comes with the perks of knowing electricity well and installing a boot release solenoid.

and yes, its a easy check with the phone. but an even simpler solution to just disconnect the switch. at the end of the day the light is soo flimsy that even at night i can barely see whats in the boot, may as well just have it permanently disconnnected

now... a warm white LED strip running along the boot lid may be an interesting alternative to light up the boot..... :roll:
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Re: battery parasitic drain

Postby Saltire » Tue 13.09.2022, 22:42

Tuga2112 wrote:now... a warm white LED strip running along the boot lid may be an interesting alternative to light up the boot..... :roll:

BTDTGTTS - but what I did was to run the LED strip around the underside of the lip of the boot aperture, so all the light is directed down into the boot and the strip is completely concealed. I did consider using a magnetic reed switch, like I’ve done for the glovebox light, but in the end I just wired it into the normal boot light switch and made sure that was properly adjusted.
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Re: battery parasitic drain

Postby peteoddcar » Wed 14.09.2022, 08:05

Good idea
I suppose this is going a bit off topic
I recently did a LED ( warm white ) footwell lamp addition on an XK150 for a customer of ours. I think I might upgrade the Elan boot light to LED and maybe fit footwell lamps, Winter job list growing nicely !
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Re: battery parasitic drain

Postby Saltire » Wed 14.09.2022, 09:36

peteoddcar wrote:Good idea
I suppose this is going a bit off topic
I recently did a LED ( warm white ) footwell lamp addition on an XK150 for a customer of ours. I think I might upgrade the Elan boot light to LED and maybe fit footwell lamps, Winter job list growing nicely !

I did that at the same time, Pete. It’s actually not too bad a job - I was able to pick up the cables which run up the offside screen pillar to the interior mirror light. I soldered a connection into them, suitably fused, and ran the LED strip along the back of the dash moulding above the driver’s and passenger’s feet. I actually had the instrument panel removed at the time, so it was very easy to see, but wouldn’t be too hard to position even so.

I found that the adhesive on the LED strip wasn’t strong enough to keep it where I’d put it, so I used a few dabs of Araldite to secure it firmly.

Makes a big difference when getting into the car on a winter evening :-D
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Re: battery parasitic drain

Postby chrism » Thu 22.09.2022, 21:27

"I recommend using a CTEK, or similar, battery conditioner. It keeps your battery in tip top condition and will add charge as and when the voltage drops"

So, mindful of Rambo's excellent advice, I've got a CTEK. I've connected the permanent battery feed line, brought it out through a 22mm dia hole in the battery cover under the hood-well carpet etc. What's the consensus; leave it fully connected throughout the week or leave it on overnight (say) once-a-week?

When my new battery went fully flat I charged it overnight and it didn't 'go green' until well into the next afternoon...got very hot too. If I connect it every few days (or, say, within a few days of a trip) it goes green within the morning and doesn't get so hot showing, I presume, that it's not needing to provide loadsa amps for the charging process.

I understand why folks leave it connected for long term storage, but what about fortnightly or w/end use? (perhaps longer since we approach chilly + rainy times) Has anyone found a 'working system' to fully avoid the dimmed-dash-lights-and-silence (that I don't want to encounter again, please)?
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Re: battery parasitic drain

Postby Fredjohn » Thu 22.09.2022, 22:18

I leave my CTEK permanently connected until I want to use the car. No ad hoc connection.

I also use cheapo Halfords chargers on other cars and leave those connected all the time too. Never had an issue.
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Re: battery parasitic drain

Postby chrism » Thu 22.09.2022, 22:39

Thanks Fredjohn; that makes sense.
Meanwhile, now that the symptoms can be managed, I can steel myself to get my head around Tuga's fuse removal method to try and find a cure :)
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Re: battery parasitic drain

Postby Saltire » Fri 23.09.2022, 07:42

I too have a Ctek which is left on. No issues. It senses when the battery is full and maintains a trickle charge from then on so you can’t do any harm.
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Re: battery parasitic drain

Postby chrism » Fri 23.09.2022, 08:40

Thanks, Saltire. That's affirmed then... :)
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Re: battery parasitic drain

Postby Rambo » Fri 23.09.2022, 11:26

Yes, I also agree with John and Jonathan's comments. Leave your CTEK or cheapo battery conditioner and it will do everything for you. Keeps your battery in tip top condition, particularly over those cold winter months :?
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Re: battery parasitic drain

Postby peteoddcar » Fri 30.09.2022, 19:22

NVH is back from its summer location. Had a lot of fun this year with the little tike.
Posed as a super car at Goodwood, went up the Hill at Shere, met with siblings at Thruxton Meet, visited an eminent Woking Technical Centre several times, happily cruised the lanes and B roads. Never missed a beat. Always a talking point.
“Is that a turbo?”
I’ll post in a week or two my findings regarding the individual modules quiescent drain. I’ll create a check list format which fuse has * millaamps.
I’d like to add that this will be based upon a sample of one.
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Re: battery parasitic drain

Postby chrism » Fri 30.09.2022, 22:48

...and should be most welcome, I'd say... :)
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