First off I'm just about done doing my single turbo harness but have one last question before I wrap it all up. I have a plug to plug that was wrapped in my harness to these following pictures showing the sensors. Is this right or did previous owner hack the wiring wrong. Thanks

Small black sensor on block

Wire connecting the two

 

the first pic is the connector for the water level sensor, this sensor has a wire with a plug to plug connector that is routed thru the emmision harness and comes out behind the power sterring pump and connects to a white single wire connector that runs thru the dash harness to the dash, that triggers the dash buzzer if water level drops.

the small black sensor on the rear plate is the water temp sensor for the gauge, this and the water level sensor should not be hook together, this sensor runs directly to the ecu.

 

the wire with black and white connectors isnt the original, because the oem is brown... but its the right connectors (white) for sensor in the 1st pic. Plug the black connector to the black connector in the ''alternator harness'', just beside the white AC connector. I just rewraped mine, jdm harness. I had to re-wire and replaced connectors.

The sensor in the 2nd pic, its the coolant temp sender gauge wich the wire is yellow, if I remember (2 wires) with a black connector, similar to the one in your 3rd picture. Anyway, its the first connector after the big firewall bushing.

 

If those two sensors were connected together with the wire shown, definately wrong. Both of these sensors are wired to and for the gauge assembly. The one on the coolant fill neck is the low coolant warning as FC3S1991 illudes and the one on the rear iron is for the temperature gauge. Neither, however, will affect the operation of the engine if wired together or not at all.

 

Thanks guys! Everything seems to make sense. Guess I got things a lil mixed up in previous owners mess. So I did find a black connector with yellowish wire running back to white connector in the interior of the engine harness. And I also found the other connector on the alternator harness to connect the coolant level sensor to. I think I'm finally confident to wrap it all back up