Through the error-proof design of the assembly line tooling, a single set of distribution is implemented for the materials that need to be installed in the assembly line, such as corrugated pipes, PVC pipes, clips, buckles, cable ties, etc., to reduce the error probability of missing materials. Install the card on the assembly line tooling board , The error-proof limit module of buckle, cable tie and protective shell can effectively prevent the wrong installation of card, buckle and cable tie, prevent the wrong installation of material model, prevent wrong direction installation, and also ensure the installation size; assembly line assembly board Use jigs of different shapes and colors for uncommon harness branches, which can facilitate the operator to perform wiring operations and terminal threading operations, and reduce branch wrapping and wrong orientation in the process of wiring harness assembly; the wiring harness with fuse box uses the corresponding wiring harness model And the porous leakage plate with different color identification can effectively prevent the fuse wire and relay installation errors.