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SC430 - 2nd Gen (2001-2010)

Alternator replacement electrical issues

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Old Aug 28, 2020 | 07:57 AM
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Default Alternator replacement electrical issues

Hello friends I have a 2002 and yesterday replaced the alternator with a 130 that matched the old alternator. The electrical is now mostly dead, yet I'm able to drive seemingly with more power than I've had in the past. There is a lower front passenger light under the glove box that was never functional, is now, also working are the hazard blinkers and the middle headlight switch point turns on the high beams and front lights,n but not the rear lights.
Most is not working: all gauges, blinkers, lights and rear brake lights, the top, all the panel console things are dead no tilt wheel, horn, gas cap, trunk switch, abs, power steering. I'm suspecting a a cable interrupt something isn't connected versus fuses. Alernator itself was rewired exactly how it was taken off. Thoughts and Suggestions? Much thanks.

Last edited by Will777; Aug 28, 2020 at 08:08 AM.
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Old Aug 28, 2020 | 12:03 PM
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I am just guessing here, but there are multiple fuse boxes in the car. I wonder if one of those boxes is not getting power, which is why so many things don't work.

Pull out your owner's manual and see if one of the boxes control most of those features.
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Old Aug 28, 2020 | 02:35 PM
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You can go thru all fuses in the fuse boxes fairly quick with a fuse tester.
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Old Aug 29, 2020 | 02:36 PM
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Charge your battery overnight and check the voltage in the morning. It should be over 12V without the engine running. If not, replace it.
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Old Aug 29, 2020 | 09:19 PM
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Will777
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Originally Posted by DshngDaryl
I am just guessing here, but there are multiple fuse boxes in the car. I wonder if one of those boxes is not getting power, which is why so many things don't work.

Pull out your owner's manual and see if one of the boxes control most of those features.
Thanks. Good idea. Not 100 percent at initial look-see. Will formally check that.
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Old Sep 1, 2020 | 07:49 AM
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Ok, all fixed. The 140amp "alternator charging system" fuse, located in the box next to the battery under the hood was blown. I could only locate a 120 so put that in and all is picture perfect again. I suspect during the first run alternator replacement where I attempted the first gen 100 amp alternator it blew. I tell you, that fuse is GØd for all but the engine in that car...
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Old Sep 1, 2020 | 09:55 AM
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Originally Posted by Will777
Ok, all fixed. The 140amp "alternator charging system" fuse, located in the box next to the battery under the hood was blown.
That's good to know. I had that happen in my pickup once, but it was a fusible link. It was a bear finding a replacement. I am glad Lexus went with a traditional fuse
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