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Re: 1991 Celica GT - Electrical Help Needed.
Did they all go out at the same time?
The lighter is on a separate circuit than the horn, so I doubt there's any coincidence there. The turn signal return is usually a mechanical, so something might have broken off the signal return inside the steering column that is jamming the horn. But you can apply 12v to the horn to check it for operation.
As for the lighter, are you getting power to the socket or does the lighter itself not pop out after you press it in to heat it? You need to check for power there too...the lighters themselves do fail. I've also had instances where I was using a power adapter and it was getting hot enough that the adapter melted a little, causing the spring-loaded tip to stop working and make contact inside the socket. Finally, check that you have a good ground from the socket to the body.
A $30 multimeter is indispensible for chasing down electrical gremlins. Hope this helps!
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