As I seem to be having wiring problems. So I thought I would ask.
The white grounding block (JC-01) on the passanger side (Drivers side for USA) has 5 wires.
I'm assuming 4 of them wires go directly to the ECU and don't bridge into anything else. But where does the 5th wire go to?
Reason I ask is my left headlight died and wouldn't do full beam even after testing the blub. I wiggled the wires coming out of the ground block and it came alive. So I'm assuming it's in relation this this wire and that it gives ground to the left hand side of the car?
This could also be in relation due fueling going mad and TPS jumping around due to a broken / crappy ground.
If the ECU goes direction to this block I will run 4 new wires to rule them out.
EDIT *** After looking at a few wiring diagrams. I am wrong in what I said.
2x ECU main ground
1x ECU sensor ground (This has 2 wires from ECU thats going in one wire)
1x Fuel Pump Switch / TPS / O2 Sensor / Coolant Sensor ground
Please do correct me if I'm wrong.
Miata mk1 1990 1.6 - MS2e