Paul J Posted October 11, 2017 Author Report Share Posted October 11, 2017 I guess its a screw-type MES holder Paul (?) - so something like this perhaps: https://www.autoelectricsupplies.co.uk/product/1381/category/119 Thanks Rob well worth a try, will let you know the outcome. Cheers Paul Quote Link to post Share on other sites
Paul J Posted October 12, 2017 Author Report Share Posted October 12, 2017 Persistence sometimes pays Thanks Rob the LED worked, the bulb lit with the L alternator wire to earth and went out on start up, I have now replaced the other switched live to the lamp with and earth, there was a polarity issue at first but swapped the wires around on the holder and all is good. Thanks to all for your input. Paul Quote Link to post Share on other sites
RobH Posted October 12, 2017 Report Share Posted October 12, 2017 Excellent Paul. Something to remember for the future. Quote Link to post Share on other sites
terryp Posted January 16, 2018 Report Share Posted January 16, 2018 My first post and I'm really sorry but I don't have a TR4 but I do have lots of TR parts on my Ginetta G4 :-) Anyway , I have exactly the same problem with my Denso Kubota Alternator. I would be really grateful if Paul J could post a wiring diagram of the final answer Thanks and best regards Terry Quote Link to post Share on other sites
Paul J Posted January 16, 2018 Author Report Share Posted January 16, 2018 Hello Terry Do you have the alternator fitted, if so is it charging ok but the ignition light does not function correctly. If so then all I did was change the bulb for an LED and change the polarity of the bulb, ie swap the earth around on the bulb holder and all was well. Paul Quote Link to post Share on other sites
terryp Posted January 16, 2018 Report Share Posted January 16, 2018 Yes exactly that, but I've even been in contact with Brise and they confirm that it should work the other way round! So basically an earth to one side of the warning lamp bulb and the other to the L terminal? Thanks Terry Quote Link to post Share on other sites
RobH Posted January 16, 2018 Report Share Posted January 16, 2018 Welcome to the forum Terry. Note that in Paul's case the bulb had to be changed for an LED type because the alternator could not give sufficient current to drive a normal one. I don't know how the bulb-holder is mounted on a Ginetta; if its an all-metal holder it might be necessary to insulate it from any metal parts in order to reverse the wires. Quote Link to post Share on other sites
terryp Posted January 16, 2018 Report Share Posted January 16, 2018 Thanks Rob, it uses Lucas WL type lamps in a fibreglass dash so it can be wired anyway. Truly wierd. I have been trying to see whether I can find a Kubota wiring diagram to see how they wire it. I will try a normal bulb first then but an LED Thanks TR4 owners :-) Quote Link to post Share on other sites
terryp Posted January 16, 2018 Report Share Posted January 16, 2018 Afraid my one hasn't worked :-( I get a constant 12v + out of the L terminal enough to light a proper bulb and I connected a drill up to run the alternator and the light doesn't go out (I rigged up a temporary earth) Tried the same with an LED Brise don't want to know as they didn't sell the alternator. I am totally at my wits end. Funnily there is loads of this on the internet. Quote Link to post Share on other sites
RobH Posted January 16, 2018 Report Share Posted January 16, 2018 If the 12V is there all the time, even when the alternator is not rotating, there is probably a fault in the alternator regulator Terry. Replacements are available. Quote Link to post Share on other sites
terryp Posted January 16, 2018 Report Share Posted January 16, 2018 Now this is funny, I read somewhere about removing the "S" cable. Hey presto the warning light works???? (The correct way round) Having checked now a wiring diagram for a Kubota machine the S wire is not connected? (I am trying to post a copy but can't find out how?) But will it damage the battery if this is not connected? Terry Quote Link to post Share on other sites
terryp Posted January 16, 2018 Report Share Posted January 16, 2018 SORTED!!! Some alternators have a "P" terminal that signals the Tacho rather than an "S" terminal. (There is nothing anywhere which tells you which is which) "Regulator has P-IG-L terminals. IG terminal activates the alternator, and L is for warning light operation. "P" terminal which carries a "Phase" signal drives the tach" This info isn't anywhere. Hopefully this may help someone else Quote Link to post Share on other sites
RobH Posted January 16, 2018 Report Share Posted January 16, 2018 Well done. (Of course if everyone stuck to using Lucas alternators, none of this confusion would happen. ) To add attachments to posts click on the 'more reply options' tab which will open a window where you can browse and select files. Quote Link to post Share on other sites
terryp Posted January 16, 2018 Report Share Posted January 16, 2018 Cheers Rob, I even bought an ACR17 but I couldn't fit the thing in! Have attached the Kubota Wiring diagram for others as we will all end up with these things :-) Moral to the story , you have to google the exact alternator model you have and find out the exact connections, even if it means googling the car or excavator (!) it comes off. The diagram for connections on the Brise Website maybe wrong for your alkternator, which I think is the problem as thats what everyone ends up finding. Thanks Terry Quote Link to post Share on other sites
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