Older cars (and a few newer ones) use a load based flasher. You can buy a solid state replacement that will flash at the same rate regardless of the load.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250