1958 MGA Saved Restoration – The Electrical System Part 2 (Installing MGA Wiring Harness)
An article by G M MacDonald
One satisfying task in the progression of restoring a car is the installation of a new wiring harness in the freshly painted body. It is really not a very difficult task to put a new wiring harness in an MGA. There is a point when you should do this – after all the painting and some of the ancillary pieces are installed, but before you have too much clutter or pieces blocking the harness run. For the MGA, a really nice wiring harnesses, with modern insulated wires inside period cloth covering, is available from Moss Motors. These typically have the connections you will need and the bulb holders for the instrument panel lighting bulbs. There are many grommets on the MGA bulkhead – and to make your life simpler you can purchase a kit will all the different assorted ones. Figure on spending more than $50 US on that. I like to use stainless steel fasteners and p-clips as well. Keeps things looking new forever.
A nice thing about rewiring the MGA is that the harness is in multiple pieces with a big bunch of connectors just above the starter on the inner wheel well. This makes it simple because you can wire the bulkhead and all the important bits like the control box, flasher system, fuses and windscreen washer with one part of the harness. Then run the harness to the headlamps and front indicators and the rear harness to the tail lights and fuel gauge. The best part is that the dash has a separate harness, so you can wire all the instruments and switches etc up on the bench, connect to the main harness when installing the dash.
Below are some pictures of installing a new wiring harness in a 1958 MGA –