Reply With QuoteHi Dave, don't bother with the black wire , the switch works fine with the one wire , the black wire doesn't need to go anywhere as the switch earths through its body
Master
SupporterHI Folks,
Can anyone please help me find where to solder in a wire I have missing from the oil pressure switch plug?
Long story short, a mechanic mate was helping me fit a 2nd hand transmission to my Disco the other day and in the midst of all the heaving and grunting he got the two wires for the oil pressure switch wiring loom jammed between the bellhousing and block.
I have the yellow wire out ok, but the black wire I only have about 100mm of it from the terminal plug end, so I assume I need to solder a length of wire back to the main engine loom (the one with connections for crank sensor, starter and glow plugs).
The problem is, I cannot find where the black wire connects back into the main loom. Unless it just goes to an earth point, I assume it has a return to the instruments or ECU. I've cut about 75mm of the conduit off the loom but still no broken black wire in there!
Does anyone know, or is anyone able to check the loom where the yellow wire goes into it under the inlet manifold and see if the black wire goes in there too?
Would be much appreciated. I'll post a picture up soon.
Cheers
Dave
ChatterBox
SubscriberHi Dave, don't bother with the black wire , the switch works fine with the one wire , the black wire doesn't need to go anywhere as the switch earths through its body
Master
The black wire is only that long on mine too, it works fine must be earthed thru the sender.
Master
SupporterThanks that helps heaps. Thought I was going nuts! Wish I knew that before I spent an hour pulling the loom apart! Turns out the starter solenoid terminal was about to drop off the loom so I'll fix that while its out.
Thanks again.
2008 D3 TDV6 SE Arctic White 200,000km
2003 D2a td5 Monte Carlo Blue 370,000 (sold)
1996 D1 300tdi Manual some greeny blue colour 240,000km (sold)
Master
Found the same when replacing some cooling hoses and outer cover on the harness, thought I'd snapped the black wire off!!
Off to the forum again for help
Sender is a single wire unit as others have mentioned, not sure what models use the earth wire return??
Cheers Lemo
Wizard
SubscriberI believe all black wires go to earth on a disco.
2002 D2 4.6L V8 Auto SLS+2" ACE CDL Truetrac(F) Nanocom(V8 only)
YarnMaster
Yes, the black wire for that particular switch is useless but is the oil pressure warning working now?
Discovery Td5 (2000), manual, tuned
Master
SupporterAnd another Disco 'feature'. If you ever have to change out the oil pressure switch there are 2 variants. One has a parallel thread and dowty washer and the other has a tapered thread.
No idea what models but my August 2002 build has the parallel threaded one. I'll check but I'm pretty sure it has 2 wires as well.
_________________________
1996 D1 V8 - gone
2002 D2 Td5 ES- gone but still running elsewhere
2013 D4 SDV6 HSE - gone
2023 Defender 110SE D300
Moderator
Glad I googled this.
I'm tidying up all the looms, all the corrugated conduit and inso tape is shagged and was starting to question my powers of observation trying to find where the black wire went!
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