E7TZ12B533A Glow Plug Controller Relay for Ford F350 1987-1994 7.3L FOTZ12B533A

Glow Plug Controller Relay for Ford F350

This glow plug controller relay, referenced as E7TZ12B533A and FOTZ12B533A, controls glow plug operation on 1987-1994 Ford F350 models with the 7.3L diesel engine.

Overview

This glow plug controller relay manages the power cycle that heats the glow plugs before and during cold starts on Ford F350 trucks with the 7.3L engine. The relay for Ford F350 diesel models helps the engine fire reliably in cold weather by regulating glow plug activation. It is built for owners replacing a failed controller on 1987-1994 models and carries the E7TZ12B533A and FOTZ12B533A references.

Built For Performance

• Controls the glow plug heating cycle for reliable cold-weather starts
• Direct replacement for the factory controller relay position
• Cross-references E7TZ12B533A and FOTZ12B533A for easy number matching
• Designed for 7.3L diesel applications in the listed model years
• Helps prevent hard starting caused by a failed or intermittent controller

Fits These Machines

• for Ford F350 1987 7.3L
• for Ford F350 1988 7.3L
• for Ford F350 1989 7.3L
• for Ford F350 1990 7.3L
• for Ford F350 1991 7.3L
• for Ford F350 1992 7.3L
• for Ford F350 1993 7.3L
• for Ford F350 1994 7.3L

On-The-Job Use

• Restoring cold-start glow plug control on a 7.3L diesel F350
• Replacing a controller that no longer cycles the glow plugs
• Servicing hard-starting or white-smoke conditions traced to glow plug control

Specs At A Glance

Good To Know

Q: What does this glow plug controller relay do? A: It regulates the glow plug heating cycle so the 7.3L diesel fires reliably on cold starts, replacing the original controller when it fails.

Q: How do I confirm this fits my F350? A: Match the E7TZ12B533A or FOTZ12B533A reference and confirm your 1987-1994 F350 runs the 7.3L diesel before ordering.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.