SupraLEDrears Posted November 30, 2019 Share Posted November 30, 2019 So I took the Supra out the other night and then the oil, cat, bulb out and battery light came on whilst I was driving and won't go off. This happened to my mate before and it was the alternator but mines charging at 14V. Anything else I should consider? Thanks Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted November 30, 2019 Share Posted November 30, 2019 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. Quote Link to comment Share on other sites More sharing options...
evinX Posted November 30, 2019 Share Posted November 30, 2019 When you test it on idle its probably fine. Under load its not Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted December 3, 2019 Share Posted December 3, 2019 Check the ALT-S fuse in the under bonnet fuse box. Check the wires CAREFULLY where they leave the alternator plug. If neither of these are broken I would suspect the alternator itself. Quote Link to comment Share on other sites More sharing options...
SupraLEDrears Posted December 4, 2019 Author Share Posted December 4, 2019 Thanks everyone, I'll check it out ASAP when the weathers better. Quote Link to comment Share on other sites More sharing options...
Konrad Posted December 4, 2019 Share Posted December 4, 2019 Usual suspect will be regulator part of alternator. You can buy it and change it yourself, just make sure you order one with right plug. https://www.ebay.co.uk/sch/i.html?_osacat=0&_odkw=toyota+mr2+mk2+regulator&_from=R40&_trksid=m570.l1313&_nkw=toyota+mr2+mk2+alternator+regulator&_sacat=0 Quote Link to comment Share on other sites More sharing options...
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