SERVICE HARNESS INSTALLATION - CORROSION OF A RESISTOR IN THE BATTERY POWER UNIT. ALSO HAVE AN OWNER'S LETTER.
full bulletin at NHTSA ↗2007 Mercury Mariner electrical problems
moderate 6 complaints filed with NHTSA · avg repair $850 · see electrical across all vehicles →
Complaints
6
Recalls
0
Avg fix
$850
When does it fail?
Of the 6 electrical complaints filed for the 2007 Mercury Mariner, here's the actual mileage breakdown — failures cluster heaviest at 25,000-50,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Electrical accounts for 18% of all owner complaints filed against this vehicle, across 3 categories tracked.
No new NHTSA electrical complaint has been filed on this vehicle in over 6 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering electrical on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
What owners are reporting 2 most recent
The recall that Ford is recalls 2007mercury mariner while driving vehicle just shuts off I was with my daughter driving on the highway lucky I was able to switch all 4 lanes the engine gets hot tempter gauge reading normal it stays in the middle turn vehicle ttb back on press pedal no power pump the pedal and hopes it stays on its been acting three months. *tr
2008 mercury mariner hybrid no crank. Vehicle was found to have damaged high voltage wiring harness. Harness runs along underneath the passenger side of the vehicle cabin. Harness is partially encased pvc. Pvc was damaged possibly due to road hazard hitting underneath the vehicle. High voltage harness was damaged resulting in entire harness being replaced. Ford would not pay for repair. This is a…
Had electrical trouble with your 2007 Mercury Mariner?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the electrical problem on the 2007 Mercury Mariner?
It's a documented issue but not catastrophic. 6 complaints have been filed. Repairs average $850 and most owners catch it before it causes a breakdown.
At what mileage does the electrical typically fail?
Based on the 6 complaints filed, electrical issues most often appear around 90,870 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $850 for electrical repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to electrical?
No active recalls currently cover electrical issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2007/Mercury/Mariner.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.