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Been opening up the wiring loom on the gti to trace back the wires to the fuse box… so far so good. The lift pump + sender looks to connect to something below (I’m presuming the pressure pump) and so far only has 3 wires connecting it to the fusebox.
I’ve looked at the fusebox in the syncro and it at least seems to be the same type as the gti (same shape plugs and stuff), although there’s a fair few more relays on the gti one. I’m just about to check the same locations on the syncro to see if the same wires already exist…if so maybe it only needs the right relay plugging in, otherwise I’ll need to piggyback the extracted fuel pump “loom” on there somehow and also add the right relays.
Have been taking pics along the way so will post them later along with further findings
you can put the central electric system into to categories, CE1 and CE2
CE1 is used on cars up to 89, and CE2 is from 89 to when the mark 4 came along (97/98)
same CE box on the Passat, Golf 2, Golf 3 and a shedload of other VAG producs from that era
http://www.a2resource.com for more info
well hopefully they’re the same – the gti was 87 and the syncro is august 89 or thereabouts. I took a bunch more pics which I’m processing at the moment. PVL said he’d help figure out what to do as my head mostly goes blank with wiring…like a cat trying to do algebra
That’s a very helpful website though – cheers! Looks like they’re both CE1 (phew!), although stuff like the fuel level sender seems to be in different places…it’s already helping me figure out the relays though
I notice that as its an American site there is no reference to the Golf Syncro, as it was never imported there.
oh ace.. the tank level sender def looked to be in a different place than on the gti. HAven’t got around to psoting pics yet but will sort tomorrow hopefully.
The tank sender has to be in the same place, I.E. in the tank! however it might be shown differently on the wiring diagram.
i mean the sender wire seemed to be in a different place on the plug which goes intot he fusebox – but I need to double check the colours and make sure I got that right.
On the G2 syncro the relay & fuse boxes are pinned out differently & some of the fuses & relays sit in different places to the 2wd Golfies
hmm so I guess I might need to find the pinouts for a gti-type syncro then to find the right place to put the fuel pump relay and where to add the pins. There were LHD syncro GTIs weren’t there but what fuelling system did they use? Though I guess perhaps the fuel pump wiring would matter whatever the injection system.
If it helps at all, the pin housings (in the CE1 connectors) should be empty and waiting for you to insert the fuel pump part of the loom. At least that’s what I found, my donor was an ’87 gti (K-jet) and the syncro is an ’89 carb model. Haynes manual wiring diagram was all I used when converting the syncro to k-jet gti spec.
If you get a proper automotive connector remover tool, you should be able to extract the part of the fuel pump loom you need, and plug it into the correct holes in the correct plugs on the back of the fusebox. Otherwise just crimp new ones on, or solder it, or whatever.
The place for the fuel pump relay (no. 62 on mine, others will do) was also free and available, it just plugged straight in. The only fiddle I had was making a frankenstein fuel pickup/lift pump arrangement out of the syncro upper part, and the gti lift pump, but it isn’t too hard to do.
I can put up a scan of the wiring diagram if it helps, from the back of the green haynes manual, as all the pinouts for the connectors and fusebox I used are listed in there.
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