unidentified electronic object

Talk about the E-Type Series 3
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Mephistopheles
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Joined: Sat Jan 06, 2018 10:00 am
Germany

#1 unidentified electronic object

Post by Mephistopheles » Tue Nov 05, 2019 6:27 am

In my E Type there was an old alarm system from the nineties, which I removed. Unfortunately I had to find out the following: the wiring harness is a pure tinkering orgy. At the moment I‘m busy to get rid of the mess and restore the wiring harness to its original condition. At the contact switch of the handbrake I found an electronic component, which is neither original, nor does it reveal its function to me. Can someone help me and tell me what it is and why it is built into the wiring harness?
Thanks and regards
Holger
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1973 manual LHD OTS E Type
Holger

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abowie
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#2 Re: unidentified electronic object

Post by abowie » Tue Nov 05, 2019 6:50 am

It's a zener werbler. It rectifies the passant signal to the flarad on the warning light.
Andrew.
881824, 1E21538. 889457..oops. Jezza the V12 XJS race car.
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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johnetype
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#3 Re: unidentified electronic object

Post by johnetype » Tue Nov 05, 2019 8:36 am

It's a diode. The green wire is the "door switch" trigger line for the alarm.

Alarms/immobilisers have a door switch trigger line which can be wired up to multiple door, bonnet, boot, handbrake switches etc. as long as they all switch to ground, i.e. the door switch or whatever has one side of the switch connected to ground. The alarm trigger line is now connecting all switches connected to it in parallel so the operation of one switch would effectively work them all so say opening the door would turn on the interior light as well as the boot light and the bonnet light. To stop this, each switch has to have a diode put in series with it so the switch goes back to only operating the light it's meant to but any of the connected switches still trigger the alarm.
John

1969 Series 2 FHC

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Mephistopheles
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#4 Re: unidentified electronic object

Post by Mephistopheles » Wed Nov 06, 2019 5:50 am

thanks for quick replies!
Regards
Holger
1973 manual LHD OTS E Type
Holger

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bitsobrits
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#5 Re: unidentified electronic object

Post by bitsobrits » Wed Nov 06, 2019 11:32 pm

abowie wrote:
Tue Nov 05, 2019 6:50 am
It's a zener werbler. It rectifies the passant signal to the flarad on the warning light.
I was going to suggest it's a low voltage retro encabultor, but upon closer examination I do believe you are correct.
Steve
'65 S1 4.2 FHC

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abowie
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#6 Re: unidentified electronic object

Post by abowie » Thu Nov 07, 2019 4:47 am

The arrow gives it away.
Andrew.
881824, 1E21538. 889457..oops. Jezza the V12 XJS race car.
http://www.projectetype.com/index.php/the-blog.html
Adelaide, Australia

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