Review on 🔌 Partsam H4 9003 HB2 Wire Wiring Harness Sockets for 4x6, 7x6, and 5x7 inch Sealed Beam Car Truck Headlights - 2PCS, Heavy Duty Headlamp by Alexander Chavis

I'm so glad this product exists. This allowed me to install these LED headlights on my 1987 Chevy P30. They are so bright compared to Sealed Beams. BUT the manufacturer H4 spark plug circuit was upside down. Not being an expert, I followed the diagram instead of testing the outlet. A ground wire in the wrong outlet caused a lot of breakage and corrosion for days before anyone told me the probable cause. Checking and replacing the wires fixed the issues (melted ignition fuse, broken turn signals, headlight T-pattern too dark). So spend another $3 on a lead tester to confirm which slots in your chassis connector are for high, low, and ground. Installation was easy aside from the confusion! FYI, my car only needed cross member wiring harnesses; Brightness was plug-n-play.