Jonathan Yarden Mar 25, 2021 · 5 min. read
In this article you will find a description of fuses and relays Western Star,
with photos of block diagrams and their locations.
Highlighted the cigarette lighter fuse (as the most popular thing people look for).
Get tips on blown fuses, replacing a fuse, and more.
Year of production:
Fuse and relay blocks
| Fuse location | Ampere rating [A] | Wire Code LN | Function |
| 1 | 10 | BA3H-10 | Start Switch |
| 2 | 20 | Bus Bar | Par Lights |
| 3 | 8 | BA03Y-10 | Headlight Switch |
| 4 | 10 | BA03K-10 | Radio |
| 5 | 20 | BA03N-10 | ECC Flasher |
| 6 | 20 | BA03K-10 | Interior Lights |
| 7 | 20 | BA03N-10 | Wiper Motor |
| 8 | 30 | BA03U-10 | Brake Light |
| 9 | 10 | BA25A-12 | Electric Horn |
| 10 | 30 | BA03T-10 | Option Battery Fuse |
| 11 | 15 | BA03U-10 | Tractor Markers |
| 12 | 30 | BA03B-10 | Trailer Markers |
| 30 | 5 | Bus Bar | ECC Battery |
| 146 | 15 | Bus Bar | DRL Power |
| 44 | 15 | BA25A-12 | ABS ECU Batt Power |
| 45 | 10 | IG03H-10 | ABS ECU Ign Power |
| 15 | 20 | IG03K-10 | Backup Lamp |
| 16 | 30 | IG03B-10 | Option Ing Power |
| 47 | 20 | IG03H-10 | Air Dryer |
| 20 | 5 | IG03J-12 | ECC Lightbar |
| 21 | 15 | AC02A-10 | Radio |
| 212 | 25 | Bus Bar | Sleeper |
| 23 | 20 | AC02B-10 | Htd Mirror/lighter |
| 24 | 5 | Bus Bar | Wiper Switch |
| 25 | 20 | AC02B-10 | Opt Accessory Fus |
| 27 | 30 | Bus Bar | Cab Heater |
| 18 | 10 | Bus Bar | RHS Low Beam |
| 19 | 10 | Bus Bar | LHS Low Beam |
| 29 | 15 | Bus Bar | RHS High Beam |
| 28 | 15 | Bus Bar | LHS High Beam |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.
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