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The mkiv Supra Owners Club

Car just died Friday the 13th 😂


sidewaysdan
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If you measure the voltage before and after startup that'll tell you if its the battery or alternator. If you don't see around 14.5V when running your alternator isn't great. If you don't see close to 13V on standing after a battery charge then your battery is struggling. Another sign will be how quickly your battery charges. If its fast to charge from flat then its your battery that has had its day.

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Your battery is good but your charging voltage is on the low side of normal. Maybe you just went a long time between runs in the car as you won't normally be using the electricity heavy items like lights and screen heaters a lot at this time of year. Other than that its looking at the terminal clamps being secure and clean.

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