Alan Armstrong Posted November 15, 2022 Share Posted November 15, 2022 Thanks to all I met at the NEC this weekend, looking at fully built cars and talkingb to those that know was extremely helpful. HOWEVER,,,now coming to the end of electrical investigations on my Herald, I came across thwe greatest no no of all. Having identified all under the bonnet wiring, I was still missing a wire from the ignition to the coil. This i identified as a white wire which passes through the flasher unit. Having found both whites (1 in to the flasher and 1 out) thw white wire to the coil dissappeared ! After cutting into more underbonnet loom, I filnd a bullet connector from the missing libve white wire onto a BLACK wire!!! What a plonker...any colour but black!! I feel relieved I found it before earthing the blacks and adding a battery! Once my new stock of bullets and connectors arrive, I can make sure all circuits are safe and not going to short out, I will add a battery and move onto re-assembling the engine to re-commission a start up (comp test first).... 2 Quote Link to comment Share on other sites More sharing options...
Howard Posted November 16, 2022 Share Posted November 16, 2022 I have encountered a similar problem on my TR with black used as a live conductor Aghh! FYI I am replacing all non standard live wiring with yellow (+tracer colour as required) to make fault identification easier. Quote Link to comment Share on other sites More sharing options...
glang Posted November 16, 2022 Share Posted November 16, 2022 Yes for any vehicle with unknown wiring before power up its best to test the battery connections to earth with a multimeter while operating every possible switch (especially ignition switch all positions) and circuit. Even then some circuits powered by relays, such as starter, OD or cooling fan will not have been proved so should be tested separately... Quote Link to comment Share on other sites More sharing options...
RobPearce Posted November 16, 2022 Share Posted November 16, 2022 1 hour ago, Howard said: I have encountered a similar problem on my TR with black used as a live conductor The one that nearly caught me out when helping a friend some years back, was that a lot of German-built cars use a Bosch standard where brown is ground. Quote Link to comment Share on other sites More sharing options...
drofgum Posted November 16, 2022 Share Posted November 16, 2022 Hi, Instead of connecting a battery for the first live test, use a small battery charger. The circuit breaker in the charger will open if there is a short, and the charger will not send damaging current through the harness. Regards, Paul Quote Link to comment Share on other sites More sharing options...
glang Posted November 16, 2022 Share Posted November 16, 2022 Got to be an old fashioned charger though as I find modern ones now dont give an output unless they detect theyre connected to a battery🥴 Quote Link to comment Share on other sites More sharing options...
Wendy Dawes Posted November 16, 2022 Share Posted November 16, 2022 When I took my Herald loom out and replaced burnt out wiring from a previous fire (before I bought it) I have now fitted in line fuses to the horn, lights and ignition circuits as a failsafe on these live circuits Quote Link to comment Share on other sites More sharing options...
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