Howo Truck Diagram - Electrical Box
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| K4 | Trailer left position light relay |
| K6 | Electric horn relay |
| K7 | Left high beam relay |
| K8 | Air conditioner power relay |
| K10 | Wiper intermittent relay |
| K12 | Work light relay |
| K13 | Trailer right position light relay |
| K15 | Air horn relay |
| K16 | Right high beam relay |
| F3 | Work light insurance |
| F4 | Trailer right position light insurance |
| F8 | Electric horn, air horn insurance |
| F11 | Left high beam insurance |
| F12 | Right high beam insurance |
| F14 | Intermittent wiper insurance |
| F36 | Air conditioning insurance |
| Y88 | Air horn solenoid valve |
| H1\H2 | Electric horn |
| E23 | Working lamp |
| X5 | 7-hole trailer socket |
| X5\1 | Non-tractor position light reserved connector |
| E3a | Left front high beam |
| E3b | Left front low beam |
| E4a | Right front high beam |
| E4b | Right front low beam |
| E40 | Left auxiliary high beam |
| E41 | Right auxiliary high beam |
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