# NHTSA Engineering Analysis EA99005
> **HEADLIGHT SWITCH** · Opened 1999-01-20 · Closed 1999-12-14
## Investigation
- **Action number:** EA99005
- **Type:** Engineering Analysis
- **Open date:** 1999-01-20
- **Close date:** 1999-12-14
- **Manufacturer:** Ford Motor Company
- **Affected makes:** FORD; MERCURY
- **Affected components:** EXTERIOR LIGHTING
- **Affected model years:** 1992, 1993
- **Affected (make, year) variants:** 4
## Summary

SUBJECT VEHICLES HAVE A HEADLIGHT SWITCH WITH AN INTERNAL, BIMETAL CIRCUIT BREAKER THAT CAN OPEN DUE TO OVERHEATING DURING HEADLING OPERATION.

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=EA99005)
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