The current price of this kit is £60.00. I purchased it from www.morrisminorspares.co.uk p/no ALT200. I bought a kit so I would have all the bits and not a scrap yard, unknown condition second hand unit.You can get kits from many part suppliers or if your inclined you can visit your local scrap yard.
I fitted an alternator to my JB type soon after I got it, I have recently been asked how you do this and so as I still have the pictures I took then, this is how I did it.
I fitted an alternator to my JB type soon after I got it, I have recently been asked how you do this and so as I still have the pictures I took then, this is how I did it.
First I must explain, my dynamo at the time was noisy so needed repair and I remembered from my previous JB that at night with lights on and wiper motor switched on the dynamo was only just coping with the load.
Another advantage of an alternator is that they have a more sensitive control of their output and do not over charge the battery.
Over charging heats the battery, distorts the lead plates and excessive gassing will consume distilled water leaving the plates/cells dry.
First thing, disconnect your battery, chassis earth terminal first.
So remove your old dynamo, remove rear support bracket, fit new longer bracket, fan belt and adjust the belt in the normal way.
If you have used your old fan belt, you might find that the alternator pulley now touches the throttle shaft that passes across the front of the engine. This is due to the fact the alternator pulley is smaller than a dynamo's, the alternator will spin faster so it will charge the battery on "tick-over". Use the one in the kit, or visit Halfords for a smaller one.
Once fitted and adjusted you will have to remount the coil, I used the top rear bracket mounting bolt. This has been fine for the last four years and has caused no problems.
Now the tecnical bit! You can wire this alternator "earth sensing" or "battery sensing".
If you have no extra electrical items i.e. a standard van, wire it "earth sensing" and you do not need any extra wires.
If you have fitted extra driving lamps/fog lamps/heated rear window/heated seats/ sat nav/etc etc, you will have to update your wiring.
For this blog I will cover the easy way.
The two wires that were on the dynamo, thick and thin, the thick wire is the out-put wire and if not already fitted with a spade terminal fit one from the kit or join to the prewired plug that fits in the rear of the alternator, repeat with thin wire.
So thick wire, wired to large spade terminal on alternator (there are two large terminals and you can use either one of them).
Thin wire to small spade terminal on alternator.
The next part is to bypass the old regulator and just leave it as a terminal box.
Remove the large wire from the "D" terminal and connect it to terminal "A".
The two small wires on the "F" terminal, remove them from the regulator box and join them together. From now on terminals "D+F" must remain empty.
Nearly done now!
If the vehicle is not already negative earth you will have to turn the battery round and fit new battery terminals. (do not connect up just yet)
If it was positive earth, swop over the wires on the ammeter and swop over the two wires to the coil.
The last thing to do is to make sure you have tighten all the bolts up and all wires are connected to the right terminals, wires have been routed so there are no short circuits/trapped wires etc.
Fit the battery terminals to the battery, with the negative terminal wired to the chassis.
Now start the engine, the ammeter will no doubt show a very high charge rate but will soon drop down to a "normal rate".
Now that you are negative earth you can fit "modern" electrical items like a radio or even electronic ignition to improve the vehicles performance and economy.
