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TSB
04-18-15
  • ADDING ADDITIONAL BULBS TO TURN INDICATOR OR HAZARD FLASHER CIRCUITS - SERVICE TIPS
Publication Date: September 3, 2004

FORD:
1999-2005 F-Super Duty
2000-2005 Excursion, F-650, F-750

This article supersedes TSB 02-21-9 to update the vehicle model years.

ISSUE:

When adding additional bulbs to the turn signal or hazard flasher circuits, isolation relays must be used in order to prevent damage to the flasher relay module and/or the multi-function switch, and to prevent erratic operation.

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