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Author Topic: 12V supply ignition switched feed in engine bay  (Read 2983 times)

Offline davetech

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  • Posts: 29
  • Thanked: 1
  • Model: Galaxy Mk3
  • Spec: 08 TDCi 2.2 Ghia
  • First Name: Dave
  • Region: South West
  • Country: United Kingdom
12V supply ignition switched feed in engine bay
« on: November 03, 2015, 11:52:05 AM »
Hi.
Could anybody please enlighten me as to where I can find a 12V supply which is ignition switched, in the engine bay of my 2.2 TDCi ?
« Last Edit: November 03, 2015, 11:52:59 AM by davetech »
Mk II 1.9 Ghia 115 TDi
Mk II 1.9 Ghia 130 TDi
Mk II 1.9 Ghia 150 TDi
Mk III 2.0 Ghia 140 TDCi
Mk III 2.0 Ghia 140 TDCi
Mk III 2.2 Ghia 175 TDCi

Offline Dr Muse

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  • Model: Galaxy Mk3 Auto
  • Spec: 2010 Zetec TDCI
  • First Name: Colin
  • Region: South West
  • Country: United Kingdom
Re: 12V supply ignition switched feed in engine bay
« Reply #1 on: November 03, 2015, 07:47:06 PM »
To take what load? There are a few but nothing you can use to power anything substantial

Offline davetech

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  • Posts: 29
  • Thanked: 1
  • Model: Galaxy Mk3
  • Spec: 08 TDCi 2.2 Ghia
  • First Name: Dave
  • Region: South West
  • Country: United Kingdom
Re: 12V supply ignition switched feed in engine bay
« Reply #2 on: November 03, 2015, 08:45:39 PM »
Only needs to provide half an amp (6W).
Mk II 1.9 Ghia 115 TDi
Mk II 1.9 Ghia 130 TDi
Mk II 1.9 Ghia 150 TDi
Mk III 2.0 Ghia 140 TDCi
Mk III 2.0 Ghia 140 TDCi
Mk III 2.2 Ghia 175 TDCi

Offline davetech

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  • Posts: 29
  • Thanked: 1
  • Model: Galaxy Mk3
  • Spec: 08 TDCi 2.2 Ghia
  • First Name: Dave
  • Region: South West
  • Country: United Kingdom
Re: 12V supply ignition switched feed in engine bay
« Reply #3 on: November 10, 2015, 11:44:38 AM »
Can anybody help?
Mk II 1.9 Ghia 115 TDi
Mk II 1.9 Ghia 130 TDi
Mk II 1.9 Ghia 150 TDi
Mk III 2.0 Ghia 140 TDCi
Mk III 2.0 Ghia 140 TDCi
Mk III 2.2 Ghia 175 TDCi

Offline Mirez

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  • Model: Galaxy Mk2
  • Spec: 03 115PS Ghia
  • First Name: Mark
  • Region: South West
  • Country: United Kingdom
Re: 12V supply ignition switched feed in engine bay
« Reply #4 on: November 10, 2015, 07:03:44 PM »
I assume this is for something like DRL's?

You'll need to make your own ignition source in the engine bay, everything in there is either low current or signal sensitive so putting a load (which will probably create noise) on anything like that is a big no-no.

The best way is to bring a signal wire in from the cabin and then switch a relay direct from the battery which will give you a clean, isolated supply.
03 Ford Galaxy 1.9 TDI 115 Ghia in Spruce Green Metallic
With cream leather interior, Full Bodykit, Remapped at 145bhp, Lowered on 18's
06 VW EOS 2.0 T-FSI 210 Sport in Deep Black Pearl
With red leather interior with full Caractere bodykit, Remapped at 255bhp and sitting on 19's
14 VW Tiguan 2.0 TDI 177 R-Line in Deep Black Pearl
With black leather interior, panoramic sunroof and bi-xenon headlights.
08 Ford Transit 2.2 TDI 115 in Frozen White
With retrofitted everything except another slidey door! :)

VCDS HEX/CAN - Scans/Coding done in Wiltshire in exchange for winegums! :)

Offline davetech

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  • Posts: 29
  • Thanked: 1
  • Model: Galaxy Mk3
  • Spec: 08 TDCi 2.2 Ghia
  • First Name: Dave
  • Region: South West
  • Country: United Kingdom
Re: 12V supply ignition switched feed in engine bay
« Reply #5 on: November 11, 2015, 11:30:47 AM »
Thank you for the reply Mirez; was beginning to think I was alone out there  :)
Mk II 1.9 Ghia 115 TDi
Mk II 1.9 Ghia 130 TDi
Mk II 1.9 Ghia 150 TDi
Mk III 2.0 Ghia 140 TDCi
Mk III 2.0 Ghia 140 TDCi
Mk III 2.2 Ghia 175 TDCi

Offline Mirez

  • Pondering the next mod...
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  • Posts: 3572
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  • Model: Galaxy Mk2
  • Spec: 03 115PS Ghia
  • First Name: Mark
  • Region: South West
  • Country: United Kingdom
Re: 12V supply ignition switched feed in engine bay
« Reply #6 on: November 11, 2015, 07:19:54 PM »
No worries, a lot of the Mk3 stuff is still new although they are getting into the DIY'ers mitts more and more now so the knowledge may increase. Electrical stuff is also a voodoo art to a lot so it can be a pain to get electrical info!

Anyway hopefully that's a good solution, the only final alternative is to grab the signal wire from a controller in the engine bay. I highly recommend NOT doing that though unless you are really stuck :)
03 Ford Galaxy 1.9 TDI 115 Ghia in Spruce Green Metallic
With cream leather interior, Full Bodykit, Remapped at 145bhp, Lowered on 18's
06 VW EOS 2.0 T-FSI 210 Sport in Deep Black Pearl
With red leather interior with full Caractere bodykit, Remapped at 255bhp and sitting on 19's
14 VW Tiguan 2.0 TDI 177 R-Line in Deep Black Pearl
With black leather interior, panoramic sunroof and bi-xenon headlights.
08 Ford Transit 2.2 TDI 115 in Frozen White
With retrofitted everything except another slidey door! :)

VCDS HEX/CAN - Scans/Coding done in Wiltshire in exchange for winegums! :)

Offline davetech

  • *
  • Posts: 29
  • Thanked: 1
  • Model: Galaxy Mk3
  • Spec: 08 TDCi 2.2 Ghia
  • First Name: Dave
  • Region: South West
  • Country: United Kingdom
Re: 12V supply ignition switched feed in engine bay
« Reply #7 on: November 12, 2015, 08:27:58 AM »
So where might I find a signal wire in the engine bay?
I'm looking at either operating a relay or more likely a NPN transistor, as my required current is so low.
The isolation provided by the transistor would also eliminate any risk from noise.
Mk II 1.9 Ghia 115 TDi
Mk II 1.9 Ghia 130 TDi
Mk II 1.9 Ghia 150 TDi
Mk III 2.0 Ghia 140 TDCi
Mk III 2.0 Ghia 140 TDCi
Mk III 2.2 Ghia 175 TDCi

Offline Mirez

  • Pondering the next mod...
  • *
  • Posts: 3572
  • Thanked: 130
  • Model: Galaxy Mk2
  • Spec: 03 115PS Ghia
  • First Name: Mark
  • Region: South West
  • Country: United Kingdom
Re: 12V supply ignition switched feed in engine bay
« Reply #8 on: November 12, 2015, 06:33:49 PM »
Theoretically you can grab it from anything that requires a constant power. Therefore any control module, the ecu itself or things like throttle bodies or even the MAF. If you are using the tranny then it's not so bad but I really wouldn't switch a relay with any of those supplies though.
03 Ford Galaxy 1.9 TDI 115 Ghia in Spruce Green Metallic
With cream leather interior, Full Bodykit, Remapped at 145bhp, Lowered on 18's
06 VW EOS 2.0 T-FSI 210 Sport in Deep Black Pearl
With red leather interior with full Caractere bodykit, Remapped at 255bhp and sitting on 19's
14 VW Tiguan 2.0 TDI 177 R-Line in Deep Black Pearl
With black leather interior, panoramic sunroof and bi-xenon headlights.
08 Ford Transit 2.2 TDI 115 in Frozen White
With retrofitted everything except another slidey door! :)

VCDS HEX/CAN - Scans/Coding done in Wiltshire in exchange for winegums! :)

 

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