AlanG Posted March 14, 2015 Report Share Posted March 14, 2015 I'm going to be fitting J Type o/d gearbox to my 4A. Has anyone a wiring diagram incorporating a relay? And what relay do I need? Thanks Alan. Quote Link to post Share on other sites
peejay4A Posted March 14, 2015 Report Share Posted March 14, 2015 (edited) The OD wiring is shown here. http://www.advanceautowire.com/tr24a.pdf Any standard automotive relay is suitable, not strictly needed for a J type but I fitted one anyway. I think the original relay, for an A type would be a Lucas 6RA. This should do the trick http://www.retroclassiccarparts.com/reproduction-lucas-6ra-relay Edited March 14, 2015 by peejay4A Quote Link to post Share on other sites
MRG1965 Posted March 14, 2015 Report Share Posted March 14, 2015 (edited) Hi Alan, agree with Pete the wiring is quite straight forward, relay provides power to o/d if either of the the two inter lock switches are earthed and the column switch is on. Any standard 30 amp 4 pin relay which is open in the non energised position will work. You could use a 5 pin relay (just ignore 87a pin). Use the 87(c2) pin to the o/d, 30 (c1) pin for the o/d load feed, 85 (w1)would be the switching feed and 86(w2)to the parallel interlock switches via column switch.You can buy the loom or making one is equally straight forward, if you are confident. Mark Edited March 15, 2015 by MRG1965 Quote Link to post Share on other sites
AlanG Posted March 16, 2015 Author Report Share Posted March 16, 2015 Thanks Pete and Mark. It'll be diy wiring but jury is still out on whether or not to fit a relay. Alan. Quote Link to post Share on other sites
peejay4A Posted March 16, 2015 Report Share Posted March 16, 2015 (edited) If you fit a relay it's an easy job to add a warning light at some point in the future if you wish. Edit: Actually thinking a bit more, it wouldn't be a problem either if you don't have a relay as long as you follow the late TR6 wiring diagram. Edited March 16, 2015 by peejay4A Quote Link to post Share on other sites
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