Motormite 85870 Tail Light Socket - Front or Rear
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Motormite

Motormite 85870 Tail Light Socket - Front or Rear

Brand Motormite 85870
Fits Ford and Mercury · 67 vehicles

Extra-long leads. Socket assembly includes extended wiring for easier installation.

Multiple butt connectors. Built with connectors for a secure electrical connection.

Female terminal. Uses a female terminal design for the socket connection.

Cross-references 5451, D3AZ13410G and S510 for the same application. See all 3.

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Tail Light Socket for Ford and Mercury Applications

Restore a secure electrical connection at the rear lighting circuit with this Motormite tail light socket, part number 85870. It is built with extra-long leads and multiple butt connectors to simplify replacement on select Ford and Mercury vehicles, including Mustang, LTD, Grand Marquis, Monarch, Capri, and Cougar applications.

Key Features

  • 3-wire female tail light socket design
  • Overall length: 10 in with wire, 2 in without
  • Plastic terminal material
  • Extra-long leads for routing flexibility
  • Multiple butt connectors included in the socket assembly design
  • Direct replacement style for rear lighting repairs

Detailed Description

Motormite 85870 is a tail light socket assembly for rear lighting service on select Ford and Mercury models. The 3-wire female configuration matches applications that use a parking light bulb socket style, and the extended lead length helps when replacing damaged or heat-affected wiring near the lamp housing. This part number 85870 is listed for 1968-1973 Ford Mustang, rear lighting service, as well as 1973-1980 Ford LTD, rear; 1975-1980 Mercury Grand Marquis, rear; 1975-1980 Mercury Monarch, rear; 1971-1977 Mercury Capri, rear; and 1980 Mercury Cougar.

This part cross-references D3AZ13410G and S510 for the same application.

Common Repair Uses

  • Broken or brittle tail light socket terminals
  • Corrosion at the rear lamp connection
  • Intermittent tail lamp or parking lamp operation
  • Heat-damaged socket housing or wiring lead issues
  • Loose electrical contact at the bulb socket

Installation Notes and Tips

Before ordering, compare the original socket terminals and connector style to confirm a 3-wire female fitment. Verify the rear lamp application on your Ford Mustang, LTD, Grand Marquis, Monarch, Capri, or Cougar and match the original socket layout before installation. Use the existing vehicle wiring and follow standard electrical repair practices when splicing the leads.

Quality Assurance

Motormite and Dorman socket assemblies are engineered with extended leads and multiple butt connectors to support a cleaner replacement process and consistent electrical connection in lighting repairs.

Related reading

This part fits 67 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelBody TypePositionNotes
1980FordLTD—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1980FordLTD—N/A—
1980MercuryCougar—N/A—
1980MercuryGrand Marquis—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1980MercuryMonarch—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1980MercuryMonarch—N/A—
1979FordLTD—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1979FordLTD—N/A—
1979MercuryGrand Marquis—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1979MercuryMonarch—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1979MercuryMonarch—N/A—
1978FordLTD—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1978FordLTDHardtopN/A—
1978FordLTD—N/A—
1978MercuryGrand Marquis—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1978MercuryMonarch—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1978MercuryMonarch—N/A—
1977FordLTD—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1977FordLTDHardtopN/A—
1977FordLTD—N/A—
1977MercuryCapri—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1977MercuryCapri—N/A—
1977MercuryGrand Marquis—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1977MercuryMonarch—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1977MercuryMonarch—N/A—
1976FordLTD—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1976FordLTDHardtopN/A—
1976FordLTD—N/A—
1976MercuryCapri—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1976MercuryCapri—N/A—
1976MercuryGrand Marquis—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1976MercuryMonarch—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1976MercuryMonarch—N/A—
1975FordLTD—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1975FordLTDHardtopN/A—
1975FordLTD—N/A—
1975MercuryCapri—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1975MercuryCapri—N/A—
1975MercuryGrand Marquis—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1975MercuryMonarch—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1975MercuryMonarch—N/A—
1974FordLTD—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1974FordLTDHardtopN/A—
1974FordLTD—N/A—
1974MercuryCapri—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1974MercuryCapri—N/A—
1973FordLTD—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1973FordLTDSedanN/A—
1973FordLTD—N/A—
1973FordMustang—FrontEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1973FordMustang—N/A—
1973MercuryCapri—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1973MercuryCapri—N/A—
1972FordMustang—FrontEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1972FordMustang—N/A—
1972MercuryCapri—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1972MercuryCapri—N/A—
1971FordMustang—FrontEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1971FordMustang—N/A—
1971MercuryCapri—RearEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1971MercuryCapri—N/A—
1970FordMustang—FrontEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1970FordMustang—N/A—
1969FordMustang—FrontEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1969FordMustang—N/A—
1968FordMustang—FrontEnsure compatibility by comparing terminals to original socket for a 3-wire female Parking Light Bulb Socket.
1968FordMustang—N/A—
Directly replaces or cross-references 3 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
5451D3AZ13410GS510