Megane Megane 225/R26(?) engine bay wiring diagram

[Mart]

Bit of a long shot, but does anyone have an engine bay wiring diagram for the 225 ph2 that could upload/email me please? (I'm guessing the ph1 & R26 would be similar as well?)

In particular, the wiring loom(s) going to/from the engine bay fuse box.

For some reason, of which I haven't yet traced back, my Meg' has an additional 7.5A-fused +ve feed that's been spliced & soldered onto one of the white wires going to the large connector on top of the fuse box (when you remove the upper cover), of which is triggered (via an aftermarket relay...stamped with the 'Ford' logo of all things!) from another white wire which also goes to said connector.

For ref', said additional +ve feed is sourced from the main supply 'pin' (thick red wire from the alternator) at the base of the engine bay fuse box.

I thought it might've been an additional/booster 12v supply for the aftermarket HIDs that were fitted, but neither of the white wires go 'live' when the lights are switched on. I removed the fuse, but it didn't seem to affect/stop anything from working either.

It's defo something that one of the previous owners have fitted, from the way the wires have been spliced/soldered onto, the inline spade-connected fuse holder, and the shady Ford relay, but I'm buggered if I can trace back to see why it's supplying a full 12v to this white wire?

 

[andybond]

@Mart,

Ill put it into the technical section you geezer.

Have you checked the resources and the meg2 manuals ?

Sounds suspiciously like its power for an amp for a sub to me

 

[Mart]

Doh. Just realised I had started the thread in General Chat.

The white wires are o.e fitment and defo not amp/audio related. It's been wired as such to give a full 12v feed to this white wire for some reason...much in the same way as when peeps 'boost' the starter motor exciter/solenoid wire on GTTs (ie, direct +ve off the battery via a triggered relay).

 

[andybond]

I dont recall seeing white at all near any terminal on my car ..

 

[Mart]

Picture below of the top of a Megane2 fuse box...

Circled red is the connector, of which has 2 white wires (one you can see on the far left) - These are the white wires which have been spliced into/soldered.

Circled yellow is the 12v feed (from the alternator/battery), which, on mine, has an additional (7.5A fused) wire/eyelet underneath the bolt - This wire runs through a relay (triggered/energised by one of the white wires), and splices into the other white wire.

 

[Mart]

No wiring diagrams in those manuals/resources unfortunately, Andy.

 

[andybond]

No wiring diagrams in those manuals/resources unfortunately, Andy.

:/

Let me have a look around

 

[andybond]

Extracted from this thread : Can I fit the original projector headlamps to my Megane? - The Mégane II Owners' Club

Looks as you suspected. Someone has done a lamp change ?

 

[Mart]

That thick white wire going to/from connector R9 is where it's been boosted with a direct 12v feed (via a relay).

As said before though, neither of the R9 white wires go live when the lights are on.

For ref', I've now binned the aftermarket cheap Chinese HIDs that were fitted, and (re)fitted o.e H7 halogen bulbs.

 

[DaveL485]

Does that wire go live with the fuel pump or starter kick? Those thick white wires are typical, on the older cars, of fuel pump or starter kick feeds.