The front (and possibly rear too) indicators for the early celicas only use one wire (+ve) for power. They complete the circut by earthing back to the chassis using the light housing and the bumper bar.
If there is anything preventing a decent connection (such as loose mountings or corrosion), all sorts of weird shit can happen with them.
It is also possible that the flasher can has died. They can do unpredictable stuff when this happens.
Cheers,
Terry
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