Technical Service Bulletins
|Publication Date: September 3, 2004|
|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.
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.
The following current ranges must be adhered to on the original flasher circuitry:
- Minimum rated current for the turn signal (either left or right) is 4.45A, at 12.8V and the maximum rated current is 5.06A at 12.8V
- Turn signal current draw below 2.83A at 12.8V will cause the flasher to flash rapidly
- The minimum rated current for the hazard flasher is 4.20A at 12.8V and the maximum rated current is 10.12A at 12.8V
Information Only – Not Warrantable
Figure 1 – Article 04-18-15