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The mkiv Supra Owners Club

Inition lights on when driving, yet alternator charging fine?


SupraLEDrears
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Some things you can investigate:

 

a) On the engine loom find the two connectors that go to fusebox. Check the 3 (na) or 5(tt) pin plug, check the white wire which is alternator sense is still intact etc. Lights will trip if alternator sense wire not connected.

b) Check wiring down by plug, very often see this wire corroded/broken

c) It's your alternator, might charge fine but circuit for L warning light might be fucked inside alternator.

d) Check orange plug in passenger footwell, make sure alterator L pin is connecting properly, no damaged wire etc.

 

More often then not its the alternator.

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