nixzy 0 Posted March 10, 2018 Hi all I am looking into rewriting my engine bay in my mk3 and I have a spare mk5 loom here can anyone tell me how compatible they are? The only difference I can see is the mk5 has no headlight relay loom, my main problem is if the 2 plugs in the firewall are the same and just plug and play? Thanks Quote Share this post Link to post Share on other sites
sheffieldcortinacentre 600 Posted March 11, 2018 (edited) They're not. The wires are in a different order in the bulkhead plugs.There's pre-facelift mk3 eng bay (ohv, ohv GT, ohc, ohc GT, plus auto of each). Then interior versions (base/L, XL, GT/GXL again plus auto of each & est of the lower 2). pre 71 are different. Facelift mk3 eng bay ohv, OHC, OHC GT/E plus auto (no auto ohv),Interior base/L, XL/Gt/E plus auto & estate .Mk4 eng bay ohv, ohc, ohc S/Ghia, cologne v6, cologne V6 ghia plus auto (no auto ohv)Interior base/L/GL, S/Ghia, plus auto & estate.Mk5 eng bay ohv, ohc, ohc Ghia, cologne V6, V6 ghia, plus auto (no auto ohv,some 82 2.0 ohc have electronic ign),Mk5 interior, base/L/GL/crusader, LS/GLS/Ghia plus auto & estate. pre & post Sept 81.P100 eng bay ohc series 1 & 2, interior series 1 & 2.You have to get the right front & rear, also the correct fuse box for the year of loom.Pre 71, 72-73, 74-76, 76-79, 79- 76- only differ due to a small triangular lug on the underside shave this off & there interchangeable. Edited March 11, 2018 by BSC Team 2 Quote Share this post Link to post Share on other sites
nixzy 0 Posted March 11, 2018 Ok cool it might have to fix my one already in the car thanks Quote Share this post Link to post Share on other sites