2005 Mercury Grand Marquis Electrical System Problems
NHTSA component category: ELECTRICAL SYSTEM · data through 07/14/2026
Source: U.S. NHTSA complaint data. Complaints are unverified reports from vehicle owners — a complaint is not a confirmed defect.
How electrical system ranks on this vehicle
Share of the 487 complaints citing each category; one complaint can cite several. Full breakdown on the 2005 Mercury Grand Marquis overview page.
What owners report
“HEADLIGHTS GO OUT OR SOMETIMES WILL NOT COME ON. LIGHTING CONTROL MODULE RELAY INTERMITTEN. LIGHTS GO OUT WITH NO WARNING WHILE DRIVING. HIGH BEAMS AND…”NHTSA complaint 10424632 — filed 09/11/2011
“AUTOMATIC CONTROLS FOR AIR CONDITIONING/HEAT DEFECTIVE IN MANY, MANY CARS. MERCURY GRAND MARQUIS 2005. SERVICEMAN TELLS US THAT THERE SHOULD BE A RECALL FOR THIS…”NHTSA complaint 10408546 — filed 06/22/2011
“WHILE DRIVING THE HEADLIGHTS WENT COMPLETELY OUT. THE HIGH BEAMS WOULD ONLY COME ON IF YOU PULLED THE LEVER FORWARD AND THIS WAS ONLY MOMENTARILY…”NHTSA complaint 10405106 — filed 06/03/2011
Excerpts are shortened and scrubbed of personal details; they are individual, unverified reports.
Electrical System complaints by year filed
Frequently asked questions
Does the 2005 Mercury Grand Marquis have electrical system problems?
Electrical System is the #2 most-reported problem area on the 2005 Mercury Grand Marquis: 70 of 487 complaints on file (14.4%). Complaints are unverified owner reports, not confirmed defects.
How many complaints does the 2005 Mercury Grand Marquis have in total?
487 complaints were on file with NHTSA as of 07/14/2026. Across all categories, 24 involved a crash, 5 involved a fire, 21 reported injuries, and none reported deaths.
What does NHTSA's electrical system category include?
NHTSA assigns each complaint to standard component categories; this page reports the ELECTRICAL SYSTEM category exactly as NHTSA defines and records it.
