flasher is slow

["Taylor, Todd S" <todd.s.taylor@lmco.com>]

My flasher on my car is very slow, when the car is at a light it hardly
flashes until I 
rev. the engine.  When the engine is off it doesn't flash at all.   This is
hard to prove when
the car is getting inspected.  It doesn't matter left or right.  
What part do I need to replace to fix this??? I replaced the flasher relay
last year and it didn't help.
Is there a flasher unit somewhere??   Thanks  Todd.

1980 MGB limited edition.

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