> It wouldn't hurt to check the bulb types.  Mistakes can be made.
>
> That said, I once had the fast flashing on one side problem and, in my
> case, it was a bad connection due to corrosion.
>

To this day, after almost two years of sporadic troubleshooting (but mostly
just wishing the problem would go away), my right turn signal still blinks
twice as fast as the left. New bulbs, tried all the various manufacturer's
versions of the blinker relay from my collection, scrubbed the connections
clean. Still blinks too fast. I like to think that it's my van's way of
telling me it's more enthusiastic about staying to the right, in the slower
lanes.

--
John Bange
'90 Vanagon - "Geldsauger"