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- ADDING ADDITIONAL BULBS TO TURN INDICATOR OR HAZARD FLASHER CIRCUITS - SERVICE TIPS
| Publication Date: August 17, 2006 |
| 1999-2007 F-Super Duty |
2000-2007 E-Series, F-650, F-750
2006-2007 Low Cab Forward
This article supersedes TSB 06-14-12 to update the vehicle lines.
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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