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Relay K104

Started by lidzvx , Dec 06 2018 03:50 PM

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19 replies to this topic

#1 lidzvx

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Location:bristol

Posted 06 December 2018 - 03:50 PM

Hi all

Anyone know where relay k104 for the battery backup system is physically on the car. Can hear it clicking but canâ€™t find it!!

Cheers

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#2 smiley

Thetan level 15

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Posted 06 December 2018 - 04:47 PM

Stick your head in the boot with a flashlight.
Loot at your left, above the wheelarch part.

You should see a black plastic coverplate.

Under that is where the relays are located.

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#3 lidzvx

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Location:bristol

Posted 06 December 2018 - 05:02 PM

With the fuses and yellow lotus relay in the boot? Yeah it isnâ€™t them. Sounds like itâ€™s coming from the front?

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#4 smiley

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Posted 06 December 2018 - 05:07 PM

Could you stick your head (upside down) in the footwell and see.

I know there are 2 black relays there for an NA. Maybe the tubby with battery backup has 3 there.

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#5 lidzvx

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Posted 06 December 2018 - 05:18 PM

I canâ€™t post a pic easily as itâ€™s too big. But in this guide shows where Iâ€™m looking. The only relays that are there are at 5 oâ€™clock Under the black plastic cover. Nothing above the battery at all. I pretty much got in the boot trying to look ðŸ˜‚

Edited by lidzvx, 06 December 2018 - 05:19 PM.

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#6 Dav220T

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Location:UK

Posted 06 December 2018 - 05:22 PM

Upside down in the OSF footwell is where you will find relay K104 (on the Turbo).

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#7 lidzvx

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Location:bristol

Posted 06 December 2018 - 05:39 PM

Ah! Was 100% looking in the wrong place. Iâ€™ll look when itâ€™s light tomorrow.

Trying to work out why with a new backup battery the relay now clicks but the central locking doesnâ€™t operate. But works fine on the main battery.

My thoughts are a bad relay or bad wiring to it. As itâ€™s quite a simple circuit.

Anyone have any more pointers?

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#8 Dav220T

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Location:UK

Posted 06 December 2018 - 06:07 PM

The relay K104 can get a bit crusty and develop a high resistance across its terminals. Mine became so bad I had 13 volts one side, and 10 volts on its output. This dropped even further when trying to operate the locking system. Perhaps try removing the relay and operating at a few times to clean the contacts up a bit as it gets so little use... Worked for me

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#9 Dav220T

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Posted 06 December 2018 - 06:14 PM

They're also mounted upside down in the most unnecessary position, because of this, the relays were "superglued" in, (kid you not). Not sure if this was my special treat, or if they're all like this! Go easy under there, as the wiper delay relay lives there too. Its quite easy to knock its lid off and ruin it, if using big nasty plastic levers to remove. lol

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#10 lidzvx

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Location:bristol

Posted 06 December 2018 - 06:17 PM

If Iâ€™m honest iv had mine nearly 7 years and only had to try and use the secret button once about a week ago when the battery died. So I was thinking the same as you and k104 is a little crusty. Iâ€™m hoping itâ€™s as simple as that!