International — 08TKK Trailer Auxiliary Circuit - How To Add
Installation
From a International service manual — check it applies to your exact model before use.
Procedure
- Locate a vacant ISO relay location in Power Distribution Center, under hood.
- Supply Ignition power to Pin-5 of relay location.
- Supply Ground to Pin-2 of relay location.
- Supply fused (30 amp) battery power to Pin-1 of relay location.
- Connect 10 gauge wire to Pin-4 of relay location.
- Route 10 gauge wire with dash harness to center chassis harness, then to end of frame.
- Install relay and fuse.
- Verify that wire at end of frame has battery voltage with key on, and is open with the key off.
Source: International service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.