yellow_cad Posted November 1, 2021 Report Share Posted November 1, 2021 On my 74 TR6, one taillight doesn't want to work. Juice is reaching the socket and I have tried numerous bulbs to no avail. I do recall something about the sockets not always grounding where they physically attach. Any thoughts would be appreciated. Jim Quote Link to post Share on other sites
harlequin Posted November 1, 2021 Report Share Posted November 1, 2021 I ran an earthing wire connected to all of the bulb holders in the rear light clusters this was then run to the front of the car where it is connected to the battery earthing point. On the way to the front it is also connected to the fuel tank. This has resolved all of the odd little problems that have occurred with the rear lights over the years, especially now that I use LED bulbs that seem to be more reliant on a good earth. George Quote Link to post Share on other sites
Steves_TR6 Posted November 1, 2021 Report Share Posted November 1, 2021 I agree that it’s probably earthing. i added an earth bus in the boot, connected by a low resistance wire to battery -ve the lamp bulb holders are quite easily modified to add an earth wire : Quote Link to post Share on other sites
yellow_cad Posted November 1, 2021 Author Report Share Posted November 1, 2021 I did a complete rewire with Advanceautowire and with my voltmeter I find juice and earth right at the socket, but the light won't work. Also, with socket in hand, when I put a bulb in, it slightly dims the other taillight. I don't really understand this. Quote Link to post Share on other sites
cp25616 Posted November 1, 2021 Report Share Posted November 1, 2021 Definitely an earthing problem. As mentioned above just run a separate earth wire. Alan G Quote Link to post Share on other sites
Mike C Posted November 1, 2021 Report Share Posted November 1, 2021 "it slightly dims the other taillight" that's generally an indication of an earth problem, Clean the socket's earth to bare metal. If you haven't got this already- I have separate & direct earths for every light plug. Earth's are the curse of everything stamped "Lucas". Quote Link to post Share on other sites
yellow_cad Posted November 2, 2021 Author Report Share Posted November 2, 2021 Your separate earth is very good advice, but I got mine going by steelwooling the grips that hold the socket in the hole til they were somewhat bright. Thanks. Quote Link to post Share on other sites
PodOne Posted November 2, 2021 Report Share Posted November 2, 2021 This what I did no more dodgy earths. Andy Quote Link to post Share on other sites
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