what do you mean in series? ill try it if i can figure out what you mean......definitely grateful for the help!

 

Disconnect the sensor and connect a bulb between the two wires on the connector. At the same time, watch the scan data for the temp. It should change if the wiring and ECU are good. I always use a bulb or a resistor. That way you're not dead shorting the wires together.
A lot of the time, on those small, two wire connectors that are close together. I'll take a 194 bulb and bend the wires down on the bulb. Then touch them to the pins in the connector. I hope that makes sense.

 

got my light rigged up and im gonna go try it tonight alongalong with clearing obd2 code and see if i get any luck....just a thought arent these bulbs 12v bulbs and the most resistance i can achieve is 5v?
also​​​​​​ this 2004 does have sai and the other sensor in bottom of radiator.... any thoughts?

 

test light did not light up. no changes in temperature or activity in the gauge. ive spent all the time now im desperate to throw money at it and replace some stuff....what first? new ecu/bcu? then i lose my original 64k on dash? this is for sale by the way lol 😩

 

The light wont light up. It's just providing a circuit for voltage to flow through back to the computer.