[Mgs] 80B, melted white-green wire from ignition switch

h.duinhoven at planet.nl h.duinhoven at planet.nl
Tue May 31 13:47:09 MDT 2022

Oh that darn heater cable again - it made a short in my GT as well after it went lose from its control position!

-----Oorspronkelijk bericht-----
Van: Mgs <mgs-bounces at autox.team.net> Namens Steve Shoyer
Verzonden: Tuesday, 31 May 2022 10:09
Aan: mgs at autox.team.net
Onderwerp: Re: [Mgs] 80B, melted white-green wire from ignition switch

Thanks to everyone who replied to my question.  I think I understand what probably happened.  I think the bullet connection between the white-green feed to the radio and the radio's wiring harness (which had an inline fuse) must have loosened and allowed the bare connector to short to ground, possibly on the heater control cable. When I removed the radio, there was no longer continuity between the white-green connector coming from the ignition switch and ground.  I replaced the ignition switch with a new aftermarket one, and I also replaced the radio.  The one that I had been using seemed fine, but it had a CD player so it was about 6" deep.  I picked up a new one without a CD player (a Jensen unit with Bluetooth for $36) that's less than 2" deep, so there's a lot more room behind the radio and it should be less likely to cause strain on the wiring.  This radio uses the same style of wiring harness as my old one so it was an easy swap.  Nothing melted when I tried the new switch and radio, so I think I'm good now.  I might try to use a zip-tie to hold the radio wiring in place and reduce the possibility of pulling the power connection apart.  I put in a 5A fuse for the switched power rather than the 10A fuse that came with the radio, hoping that it would blow quickly if there was a short somewhere in the circuit that I didn't see.

--Steve (1980 MGB)


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