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Hi rob1miles, It looks prety sealed. Possibly drilling the rivets out would make it possible to prise the back plate off (it looks a very tight fit, and there is also a rivet in the centre of the backplate too). I don't think it was intended to be accessible! I checked the resistance between...

Hi mystery, Good diagram of the whole charging circuit, including the inside of the regulator! Just checking whether you meant the charge indicator light, or the light that comes on when you turn on the ignition and goes out when the engine starts? Different things in my case. Please see...

Hi Exmil109, Good and bad news. It worked for a short while with the new 4TR - 14.4v across the battery. Then the regulator got warmish, there was even a slight electrical burning smell. Now 16.5v across the battery! I have re-checked all the wiring. Is it possible that the 4TR wasn't good...

Hi ExMil109, Thanks, that's a useful tip. There has been a major discovery. Which is that (presumably by whoever put in the 1970s Japanese replacement regulator) the F+ve lead had been earthed where it came out of the loom near the relay! It looked orignal, so I assumed that was meant to be...

Still a mystery! Have tried both of the latest alternative wiring schemes. Only charges when the regulator is bypassed (and then of course, after a while, too much, because it is not regulated). I am persevering with the last wiring diagram. I think Solihull would have been less likely to...

Hi, Your last post got me thinking (so many thanks!). The attached is an alternative I think? Also there was a definitely a connection from C2 on the relay to the old regulator, and F-ve from the field coil also went to the regulator. This could be it!

Hi rob1miles, All good thoughts. Thanks. The detailed description you sent suggests that the regulator only makes a connection to earth when it senses the voltage is over 14.4v - that's how it temporarily stops the alternator producing electricity, by shorting regulator + to earth, and breaking...

Hi Exmil109 & rob1miles, What are your views on the attached revised diagram? My thinking is that if the F+ve lead is connected permanently to the battery within the loom, then the relay must be about switching F-ve on and off?

A further development: F+ve turns out to be permanently live! Hadn't even thought of that possibility until now, but wondered why the alternator would charge with the regulator bypassed. Still trying to get my head round what they did in Solihull!

Hi rob1miles, Coincidentally, I have 4 children! So it's a similar situation. I liked the bit about them meeting people, who helped them fix it every day! I think that's one of the benefits of an old Land Rover, you will meet people in remote areas who have a lot of knowledge, and are used to...

Hi rob1miles, Hadn't seen that. Looks like they are having fun in their defender! Taking roughly my proposed route through Turkey and Armenia, to Azerbaijan and across the Caspian from Baku. There and back in 3 months in my case though - the maximum I can reasonably escape from work! I am...

Hi Exmil109 & rob1miles, Thankyou both for your help with this. The level of detail, and the further understanding, really does help. I am getting to the point where I think I might be able to fix this, when it inevitably goes wrong, in some remote village in Uzbekistan (where I am planning to...

Hi ExMil109, Thanks very much for your help with this. Much appreciated! I think you are right about the regulator. My setup is -ve earth. It also seems to have a few idiosyncrasies! Most confusing one is that the alternator field (F +ve), negative of course on your wiring diagram, goes...

Hi Exmil109, I seem to be one of the 'fortunate few' to have a Series 2A with an 11AC! LR workshop manuals I have don't refer to this brief departure on changing to alternator/-ve earth (although Autobooks mentions it briefly). The wiring diagram could be very useful in trying to put it back...

Hi rob1miles, Thanks for your further thoughts. After a bit more investigation I found the remains of a 4TR (a couple of small bolts, at the right spacing, with small remnants of bakelite attached, just above the location of the second photo). I have now got a 'new' 4TR - the early version with...

Hi rob1miles, Thanks for your thoughts, and for the link. I think it is a regulator, although adimittedly, it is odd that it has only one coil. Other Lucas models do have a voltage regulator bobbin, and one next to it that is a cutout. The yellow wire in the photo leads to a contact (not very...

Hi, I have a 1970 Series IIA, 2 1/4L Petrol. It is from that transitional period where they were switching from dynamo to alternator, and I have the original Lucas 11AC alternator (which LR borrowed for a short while from Triumph Stag, Jaguar etc, before adopting the 16ACR with integral...

Just wanted to thank all for your thoughts. And Stoneytd5 you are a genius! It was exactly what you said.

Many thanks Stoneytd5, I am trying your suggestion (I like it because it doesn't involve taking the engine apart!). Taking me longer than I thought to remove the starter motor, due to corroded allen bolt, so thought I would just let you know.