Staff Answer
Oct 16, 2026 - 02:44 PM
Fuse Box Locations & Access
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Passenger Compartment Fuse Box (Interior Dashboard):
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Location: Positioned under the driver-side dashboard, mounted on the lower kick panel wall to the left of the clutch/brake pedal assembly.
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Access: Pull open the removable plastic trim cover panel or unlatch the access door under the lower dash. A circuit diagram decal is affixed to the inside of the panel cover door.
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Engine Compartment Relay & Auxiliary Fuse Center:
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Location: Located on the driver-side inner fender wall inside the engine compartment, adjacent to the air filter housing and battery.
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Access: Unclip the plastic protective cover lid retaining tabs and lift straight up to reveal system relays (fuel pump, starter, headlight) and high-current blade fuses.
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Battery Terminal Fusible Link Wire Harness:
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Location: Connected directly to the positive (+) battery terminal post or adjacent starter solenoid terminal in the engine bay.
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Access: Inspect the color-coded wire elements (green/brown/red insulated links) protecting main ignition, charging system, and glow plug controller feeds on diesel models.
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Key Fuse Assignments & Circuit Layouts
Passenger Compartment (Interior Dashboard) Fuse Panel
| Fuse ID | Rating | Protected Circuit / Function |
| CIGAR | 15A | Cigarette Lighter & Front 12V Power Outlet |
| ROOM LAMP | 10A | Interior Dome Lamp, Digital Clock, & Cargo Light |
| AUDIO / RADIO | 10A | Radio Stereo Unit & Memory Supply |
| WIPER / WASHER | 15A | Front & Rear Windshield Wiper Motors & Washer Pump |
| HEATER / BLOWER | 20A | Climate Control System HVAC Blower Fan Motor |
| TURN / HAZARD | 15A | Directional Turn Indicators & Emergency Flashers |
| METER / IGN | 10A | Instrument Cluster Gauges, Charge Indicator, & ALDL (OBD-I) Port |
| TAIL LAMP | 10A | Tail Lights, License Plate Light, & Parking Lamps |
| STOP LAMP | 10A | Rear Brake Lights & Horn Switch Circuit |
| POWER WINDOW | 30A | Power Window Circuit Breaker / Power Door Locks |
Engine Compartment Relay & Auxiliary Fuse Block
| Fuse / Relay ID | Rating | Protected Circuit / Function |
| MAIN / ALT LINK | 80A / 100A | Main Alternator Output & Engine Bay Power Supply (Fusible Link) |
| FUEL PUMP | 15A | Electronic Fuel Injection (EFI) Fuel Pump & Relay Feed (1988–1991 2.6L/2.8L) |
| HEAD LAMP (L) | 15A | Left Headlight Assembly (High/Low Beam) |
| HEAD LAMP (R) | 15A | Right Headlight Assembly (High/Low Beam) |
| ECM / IGN | 15A | Engine Control Module (ECM) & Ignition Coil Feed |
| GLOW PLUG LINK | 60A | Glow Plug Controller & Preheat Relay (C223 Turbo-Diesel) |
| A/C COMP | 10A | Air Conditioning Compressor Clutch Relay |
| HORN RELAY | — | Horn Switch Relay Unit |
Watch the video below to see a step-by-step visual guide to testing and replacing fuses on an Isuzu Trooper:
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