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Joined: Feb 2016
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Talk Morgan Guru
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Talk Morgan Guru
Joined: Feb 2016
Posts: 7,941
Likes: 218
That relay chosen should be fine Crowbar. Also you can ignore Doug's otherwise valid comment as it's not a diode relay and doesn't need to be for your age of car. Battery polarity is irrelevant therefore.

I would disconnect the wire to fog lamps at relay pin 87. Operating your fog lamp switch then you should just hear the relay click. If this is the case you have a short to ground on the live feed to fog lamps. Carefully trace the power feed after relay to find it, maybe disconnecting at fog lamps. FWIW I would suspect issue is in one or other of fog lamps themselves - a continuity tester would reveal. Once sorted replace feed wire to relay pin 87 and change fuse to 15 amp. Do not go above 20 amp!


Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
1 member likes this: Deejay
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Crowbar Offline OP
Learner Plates Off!
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Learner Plates Off!
Joined: Mar 2013
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Well problem solved! Looks like I was a bit sloppy with the solder blob on the hot contact in one of the lights and it was shorting on the light housing. Redid the connection and now the lights are on with a 10 amp fuse!

Many thanks to all here for the help!

Best,

GC


1965 Plus 4
2008 997 Turbo Cab
1981 Alfa Spider
1954 Austin Healey 100 (SOLD)
2013 M3W (SOLD)
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