disco_al Posted November 30, 2011 Share Posted November 30, 2011 Does anyone have a wiring diagram on how to use relays to supply power to the headlights? Aux lights are easy to sort out, but i'm a bit confuddled when it comes to using them for the headlights ie dip/main do they need separate relays, or can i use a changeover relay instead? Quote Link to comment Share on other sites More sharing options...
SORNagain Posted November 30, 2011 Share Posted November 30, 2011 I got fed up with the very dim headlights on my RRC, which for the main part was due to voltage drops in the wiring. I used 2 relays for each headlight - a change over relay for the dip/main beam and another with a normally open contact to switch power onto the common contact of the dip/main relay. I used separate fuses too - don't want them suddenly going out on a twisty country lane! I smashed a headlight bulb and soldered wire in its place, so I could just plug this into the socket for the original headlight bulb to feed the coils of the relays. This way I could keep the loom original. The live feed I took straight from the back of the alternator. The headlights are now transformed, in fact I lose virtually no voltage in the loom so thay get the full 14v from the alternator. I find I am having to replace the bulbs a bit more often now though! I remember there was some subtlety in the wiring for the relays, but can't quite remember what that was. Will see if I can find the diagram if you like... Quote Link to comment Share on other sites More sharing options...
SORNagain Posted November 30, 2011 Share Posted November 30, 2011 Got me thinking now...I think it was just that I had to put the change over contact upstream of the other one like this: This is so I got the change over functionality for the 'flash', which the original loom did not provide (both fillaments were on simultaneously) I have missed off the 20A fuse on the live feed, but you get the idea. If your existing loom works how you want you could use 2 SPST relays I suppose. Hope this helps Quote Link to comment Share on other sites More sharing options...
mmgemini Posted November 30, 2011 Share Posted November 30, 2011 Here use this. It's only been around for six years http://landytown.myf.../about7578.html Quote Link to comment Share on other sites More sharing options...
disco_al Posted December 3, 2011 Author Share Posted December 3, 2011 found this http://www.cabby-info.com/Files/RelayingTheHeadlights.pdf while searching the interweb - excellent guide Quote Link to comment Share on other sites More sharing options...
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