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MG MGA - Wire Harness Replacement

Well, I did it. I replaced the wire harnesses on my 1500. Just in time for the beautiful autumn weather ahead. All went very smoothly. I only had to work out a couple of small bugs. When I first cranked her up, oil was streaming from the oil pressure guage. I had only finger tightened it during reassembly. And the headlights were quite dim. I checked the grounding point at the front right fender and sure enough, it needed to be sanded down to remove the paint and corrosion.
I do have some advise for any novices, such as myself, who are thinking of replacing their wiring loom. Don't start by removing the old wiring. Start by cutting the old main wire artery at the firewall but leave the individual terminals connected. Feed the new wire harness through the firewall grommet and start replacing each wire, one at a time, color to color, until they are all replaced. Use the old wires as a guide to show where the new wires connect. I guess some of you long timers are saying... DUH!
Cheers,
Stan
S. H. Shanks

Stan, Very good advice, indeed. I did as you did earlier this year and it worked great with the exception of the 50 years of jury rigging behind the dash...Dennis
Dennis Suski

I ran a ground cable along the driver side of the frame with a connection to the battery. It extends from the tail lights to the head lights. It included a loop over the Trans with a connection to the starter and continued to a ground point were the front harness attaches to the main. A leg also goes up to a bolt on the firewall were I brought all gauge lights to it. It is almost non detectable and works extremely well with hardly any dimming.
WMR Bill

This thread was discussed between 16/09/2009 and 22/09/2009

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This thread is from the archive. The Live MG MGA BBS is active now.