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Electrics / Re: H4 headlight
« Last post by banquo on September 24, 2020, 12:42:52 pm »I took a live feed and earth directly from the battery, with the live feed going to a micro relay triggered by a feed from the brake light switch, so it switches on with the ignition. That feed is taken all the way to the headlamp shell, where it feeds another two micro relays, one for main beam, and one for dip. The relay coils are fed from the main beam and dip feeds from the dipswitch, respectively. That way, I have a heavy cable from battery to relays to minimise voltage drop, and remove the headlamp current from both light/dipswitch and ignition switch. The easier way would be to divert the feed from ignition switch to the light switch to the relay inputs, thus removing the load only from the light switch, but it was easy to bring a dedicated feed from the battery, and I thought that unloading the ignition switch was probably a good thing to do. Bringing a heavy earth cable from battery to the bulbholder also minimises voltage drop.