Mike Atwell Posted August 24, 2016 Report Share Posted August 24, 2016 Hi, My headlamp main beams have stopped working. 1974 TR6. The dipped beams and side lights work fine. Does anyone know if the main beams have a fuse or a relay that solely works the main beams. My bulbs are good. Any suggestions are welcome. Quote Link to post Share on other sites
tthomson Posted August 24, 2016 Report Share Posted August 24, 2016 Based on your description that Dip works, and the side lights are OK, the Lighting switch on the dash is working. Some background: The headlamp wire from the Lighting switch (Blue) connects to the DIp/Main column switch. The Blue/White wire from the Dip/Main switch feeds Main beam and the Main beam indicator in the speedo. The Dip/Main column switch also incorporates a headlamp flasher facility. Test 1: Does the headlamp flasher on the column work? (Main beam on and indicator lights up) If yes: it is likely the dip/main switch section of the switch If no: Probably a wiring fault - check that the Blue/White cable is not disconnected from the column switch (under the dash) Good luck TT Quote Link to post Share on other sites
Mike Atwell Posted August 24, 2016 Author Report Share Posted August 24, 2016 Thanks TT You are probably right that it is the Blue/White wire. Quote Link to post Share on other sites
barkerwilliams Posted August 24, 2016 Report Share Posted August 24, 2016 Mike, As above single blue white wire from dip switch to nearside just behind headlight then splits into a separate wire for NS & OS lamps in a 4 way bullet connector which does suffer from corrosion. Lots of bullet connectors in that position for side, indicator, horn, dip headlamp & main beam and can get corroded from water ingress. There are no relays or fuses for headlights in a standard wiring setup. Alan Quote Link to post Share on other sites
wheeler Posted August 24, 2016 Report Share Posted August 24, 2016 Mike You will find a set of TR6 circuit diagrams showing wire colours here http://advanceautowire.comshould help with fault finding I assume you have a multimeter. Quote Link to post Share on other sites
matttnz Posted August 25, 2016 Report Share Posted August 25, 2016 Mike You will find a set of TR6 circuit diagrams showing wire colours here http://advanceautowire.comshould help with fault finding I assume you have a multimeter. Mike:CR series isn't at this site. Use this instead. Checking the High beam switched vs the high beam "pull to pass" may distinguish a purple v blue circuit issue and also bypasses the dash switch. From your description TT sounds like he has the issue sorted Quote Link to post Share on other sites
Mike Atwell Posted August 25, 2016 Author Report Share Posted August 25, 2016 Thanks everyone. I plan to "attack" this at the weekend. Quote Link to post Share on other sites
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