SOURCE: i have a 2000 pontiac montana and the lights are not working righ
If you live in a area in which salt is used on the roads, you probably have a corroded ground connection.
These can be tough to find since there are several grounding points in most vehicles.
When a ground fails, the current (the applied 12V) will find its own path to ground and can pass through different light bulbs on the way.
If it was only the signal flasher creating problems, this can be caused by a single failed light bulb; the flashers are thermal devices and when the current is lower than it should be, the rapid flashing alerts you to the failure.
You might consider buying an after-market service manual from Haynes (my first choice) or Chilton.
The manuals I have for our various vehicles give a general location for the grounding points; for example, 'Right side engine'
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