I/S temp light stays on...

[TJ]

Installed a new (used) motor in a 99 I/S...  Temp light stays on when you start (cold or warm )
Both sensors have been replaced,Check for pinched wires (none found) , Fan is working....
Thermostat replaced and working , all new hoses...
Any help ....   

[R J]

Sounds like ya got 2 wires reversed.

Ya is hot all the time to the light, and it has found a ground.

[TJ]

Have checked everything that I can think of 2 & 3 times... Can't find anything worng....

[Thunderbolt]

The other side of the light is battery, so the green/blue wire must be grounded somewhere going to the sensor, would be my guess.  It has to have ground on that wire to light the lamp.

[cef2lion]

Not sure if this might help but I had a similar issue. This past summer I installed an I/S fairing on my '98 STD. I had to swap in the I/S wiring harness. A bit of work. I ran into the same issue with my temp light. I did some reading in the shop manual.

The I/S uses a different sensor.

37760-MAV-003

The STD/Tour used this sensor up till '99 when the I/S came out. I think that but not 100 percent sure.

37750-PC1-004

The older sensor also used a relay under the left side cover. Since I was using an I/S harness I didn't have the relay and my light was on all the time. I swapped in the I/S sensor up by the thermostat and it corrected the issue.

Note the the sub-harness to these sensors is different. The sub-harness plugs into the main harness. The older and newer sensor have different type connections on them. I just changed the end on my sub-harness. Maybe you got the sub-harness with you replacement engine and it has the older sensor on it. If you still have the I/S engine grab the sub-harness and sensor and see if thaat fixes the problem. The service manual says to ground the lead to the sensor as a test. The light should stay on for 2 seconds and go out. If that test passes you have a sensor issue and maybe the issue I described above.