ELMA 1 Posted November 20 Hello all - Newbie here . . Today had a run out, previously all good but somehow I have lost the dipped headlights. They do come on with the main beam. Other symptoms are the small indicator light on the rocker switch goes out when the switch is advanced from side lights to headlights and there is no blue indicator light on the dash when the main beam is on . . . . It appears I have the uprated wiring loom as yellow plug which I assume is the "dim-dip" resistor is NOT connected. . . . is this likely a simple relay failure ? Quote Share this post Link to post Share on other sites
fendervg 33 Posted November 20 I think I saw this on FB if you posted there too - dim dip resistor disconnected is correct if you have an uprated loom. Could be a relay failure, most decent looms keep the OEM plugs intact (if not they will use spade connectors), so you could try bypassing it by connecting the original loom back in - one plug (usually drivers side) should just be sitting loose and unconnected in the bay, and the other on the passenger side will be connected to the new loom to control the relays. If the relays and fuses are not in a water tight sealed box, they can get wet or corrode. Quote Share this post Link to post Share on other sites
ELMA 1 Posted November 20 Yup am reaching out across both medium - The yellow dim-dip connector is disconnected - Am trying to find a simple key to the relays / layout so I can check the relevant ones as the handbook and wiring diagramme manuals are impossible to fathom . . Quote Share this post Link to post Share on other sites
Dox 23 Posted November 20 (edited) The relays will be the same, switch them around to prove your theory? Get someone to operate the switches whilst touching the relays to feel for the click Edited November 20 by Dox Quote Share this post Link to post Share on other sites
Dox 23 Posted November 20 You can use a 9v tv remote type battery to test a relay in conjunction with a multimeter, the pins spacing on the battery means you don’t need wiresSent from my iPhone using Tapatalk Quote Share this post Link to post Share on other sites
fendervg 33 Posted November 20 As above - great diagram. The current coming in from the headlight switch (this will be the old main beam cable, which is one of the reasons why these are needed as the current goes through the stalk and the headlight switch) will open the relay to send current direct from the battery to the headlight. Will 9v be enough to trigger the relay? Quote Share this post Link to post Share on other sites
Dox 23 Posted November 20 20 minutes ago, fendervg said: As above - great diagram. The current coming in from the headlight switch (this will be the old main beam cable, which is one of the reasons why these are needed as the current goes through the stalk and the headlight switch) will open the relay to send current direct from the battery to the headlight. Will 9v be enough to trigger the relay? Yes, give it a go. I built my first MK2 loom and didn't know which pin did what, 9v clicked the relay and I built it around that. 85 / 86 close the contacts 30 - 87, let there be light Quote Share this post Link to post Share on other sites
ELMA 1 Posted November 22 So have a knocked up a new feed loom from the battery with two live and 2 earth cables with independent fuses (was thinking 20 or 25 amp ?) The original set up had two 40 amp relays (one of which sounded dodgy) so have sourced 2 new and thought 30 amp would do. The question is that the original (as installed) wiring is a Yellow and a Yellow/Black which feed the headlights then a White and a White Black which feed the Main Beam . . Can any-one help as regards which is the switch wire (87) and which is the feed wire (86) Quote Share this post Link to post Share on other sites
fendervg 33 Posted November 23 As above - just test them with a 9v battery - the one that will be the switching wire that comes from the stalk will be the one that clicks. There is usually a small diagram on the relay as well. The feed will be permanent live from the battery. Check this page out - 86 is switched, 87 to headlights, 30 from battery (+, fused) and 85 to battery (-) https://www.danielsternlighting.com/tech/relays/relays.html 1 Quote Share this post Link to post Share on other sites
ELMA 1 Posted November 25 Dox, fendervg - Thanks very much for all your your help, am all done and lights are working as they should 1 Quote Share this post Link to post Share on other sites
fendervg 33 Posted November 26 Great to hear - can you share what it was in the end to help others with similar issues? Thanks Quote Share this post Link to post Share on other sites
ELMA 1 Posted November 26 Car at Wheelbase in Hersham now for MoT check so will do - Ill sketch up loom and add photos and post it soon as it comes back- Quote Share this post Link to post Share on other sites
