Tim3324 Posted October 17, 2022 Share Posted October 17, 2022 1990 defender 90 300tdi I need some help identifying this wire. Blue/green stripe on the main engine harness. Next in line from the alternator. And the same wire is at the back of the harness. My research says it’s the main harness solenoid connection. I can’t find anywhere to plug it. The motor was swapped to the 300tdi. Quote Link to comment Share on other sites More sharing options...
Daan Posted October 17, 2022 Share Posted October 17, 2022 Is that not oil pressure? Will need to have a look on mine. Or fuel solenoid? Quote Link to comment Share on other sites More sharing options...
western Posted October 17, 2022 Share Posted October 17, 2022 There is NO Blue/Green wire, it's Green/Blue trace & is for Coolant temp, some of the engine looms have 2 one near back of engine for earlier engines like the TD & later engines like 300Tdi as some had EGR coolant sender at cylinder head to EGR ECU & the temp sender at thermostat housing for temp gaug, if no EGR fitted, just safely secure the rear wire to the rest of the engine loom. 1 Quote Link to comment Share on other sites More sharing options...
Snagger Posted October 17, 2022 Share Posted October 17, 2022 I think the solenoid wire is white with a coloured trace, not green - green tends to be for instrumentation rather than controls (and light circuits). I think green with blue is for coolant sensing, green with black for the oil pressure switch. Quote Link to comment Share on other sites More sharing options...
monkie Posted October 17, 2022 Share Posted October 17, 2022 The injection pump solenoid wire is white as far as I know (ignition on live). There is a light green with green trace for oil temp and a blue with green trace for one of the wiper motor wires, could it be one of those? Quote Link to comment Share on other sites More sharing options...
Tim3324 Posted October 17, 2022 Author Share Posted October 17, 2022 Thanks for all the responses. Sorry it is a green/blue stripe wire. The green/blue stripe wire is on the same harness as the alternator and starter. The wire in the back has a a connection that from 2 green wires to one. I figured it was something important. Not sure what year engine was put in. The engine serial number- 18l04691a. I think Westerns comment about it being the EGR may be correct 1 Quote Link to comment Share on other sites More sharing options...
cackshifter Posted October 18, 2022 Share Posted October 18, 2022 I think is part of the egr, going to the w terminal to get an engine speed reading Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted October 18, 2022 Share Posted October 18, 2022 5 minutes ago, cackshifter said: I think is part of the egr, going to the w terminal to get an engine speed reading As Western says - green/blue is coolant temp sensor. Attaching it to the W terminal could easily damage your gauge(s). 1 Quote Link to comment Share on other sites More sharing options...
Snagger Posted October 18, 2022 Share Posted October 18, 2022 Some engines have their temperature senders in the thermostat housing, some in the rear end of the head, between some of the head bolts. Your loom looks like it was made to accommodate either. It is cheaper for the cap factory to use extra wires to make one standard loom for all their versions of a specific model rather than make numerous versions of the loom that complicate the logistics side. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.