Description

Mitsubishi Galant 1998 Wiring Diagram – OEM Factory Manual (36 Pages)

If you are trying to fix a 1998 Mitsubishi Galant electrical problem without the factory Wiring Diagram, you are working blind. I have spent 28 years under hoods in San Antonio, and I can tell you that guessing wire colors or chasing grounds without the right schematic burns billable hours and fries modules. This 36-page PDF is the original Mitchell scan from 1998 – not a third-party rehash. It shows you exactly what the engineers intended: which circuits run through the multiple-purpose fuse block, which side of the dash the ignition switch feeds, and where the auto compensation switch lives.

Every page in here is scanned from the 1998 release, so you get the A/T cooling fan circuit, the condenser fan motor paths, and the dedicated service connector locations that changed between 1990 and 1993 models. The OCR excerpt on page one alone shows the radiator fan motor relay path and the fuse 2 (10A) and fuse 5 (15A) feeds. That kind of detail keeps customers from blowing 40-amp fuses on a circuit that only pulls 10. Do not trust aftermarket diagrams that use generic symbols – they miss the NCA terminal designations that Mitsubishi used.

Cooling Fan Circuit: Tracing the A/T Signals

Page 1 of the manual covers the cooling fan circuit for the A/T version of the 1998 Galant. You will see the auto compensation switch (mounted on the spring mount back of the engine compartment) and how it ties into the plug 5 service connector. Instead of guessing which wire triggers the condenser fan, you follow the BLU/RED traces right to the dedicated service connector. That saves hours of backprobing.

Fuse Blocks and Power Distribution

The schematic shows two separate fuse blocks: one on the left side of the dash and one on the right side of the engine compartment. The manual labels every fuse rating – 10A for multiple purpose, 15A for the one under the hood. If you are installing a aftermarket radio or lights, this section alone will keep you from tapping into a always-hot circuit that feeds the airbag control unit.

Service Connector Locations – Plug 5 and Plug 8

Factory manuals tell you where the diagnostic connectors are physically located. Plug 5 is a service connector used from 1990–93; Plug 8 is the dedicated service connector on the right side of the engine compartment. Without this information, you might spend an hour looking for a connector that is tucked behind the battery tray. The manual shows both with wire color references.

Why the OEM Color Coding Matters

Third-party wiring diagrams often simplify wire colors to red/black/green. The 1998 Galant uses BLU/RED, BLU, NCA, and GEN designations – each stripe means something to the factory technician. One wrong assumption and you short out the ECU. This manual preserves those original color codes exactly as Mitsubishi printed them. For more on reading automotive schematics, see this Automotive Wiring overview. The same principles apply across manufacturers, but the Galant has its own quirks.

3 Reasons to Choose OEM Documentation

• Printed from the original Mitchell scan – not a re-drawn copy that loses splice locations.
• Includes the auto compensation switch and both service connectors – often omitted from generic books.
• Fuse ratings and wire gauges are factory-tested; aftermarket diagrams may quote incorrect ampacity.

If you need related resources, check the Mitsubishi Galant 1989-1993 Service Manual for mechanical repairs, or the Mitsubishi Galant 1990 Wiring Diagram for earlier models. For minivan owners, the Mitsubishi SPACE WAGON 1998 Wiring Diagram Factory Manual 165 Pages covers similar body harness layouts.

FAQ

Does this manual cover the 1998 Mitsubishi Galant engine performance circuits?

Yes. The cooling fan circuit is directly linked to the A/T transmission control unit. The manual also shows the generator (GEN) wiring and multiple fuse-fed power lines.

What page shows the dedicated service connector pinout?

Plug 8 appears on page 1 of the 36-page document. The color code for the BLU/RED wire is listed in the diagram. Do not assume plug pinouts are the same as earlier models.

For additional reference on Automotive Wiring techniques, watch a few videos before you start cutting. But the only sure way to fix a 1998 Galant harness is to hold the factory print in one hand and your multimeter in the other. Access the Factory Manual now and stop replacing parts you do not need.