How not to B33!

[Dan_B33]

Small update:
Most of the parts I need (at least the ones so far determined)wait I UK for shipment. Some to be delivered still to my brother from Dragonfly.

I have run my bike on idle after rebuild (that was recommendation from guy who made my cylinder and piston).

Yesterday I have checked the sump plate drain plug(magnetic).
Pictures bellow. Oil is very clear as most of the metal dust is attracted by magnetically by plug.

[Dan_B33]

Electricity!
At some point I will be forced to face it!
I have positive earth setup. All that has to go and be rebuilded.
Now at this stage I'm considering to make it negative earth.
My electromechanical regulator does nothing so have to replace it anyway. If I make negative earth installation then all LED bulbs would work . I will make wiring myself rather than buying new harness.
Any downside to that concept except ?

[Dan_B33]

How about Dynamo in that case?

[Dan_B33]

Dynamo is positive earth as well. At least this is what multimeter shows.

[Rog1]

My M33 has (or had until the regulator went out of adjustment and blew some!) LED bulbs throughout, and it is positive earth. Either way you'll probably have to specify whether you want positive or negative earth bulbs when you buy them. I'm going for an electronic regulator, the type that fits inside the old mechanical regulator box.

This company sells most of the things you'll need for a rewire: https://www.vehiclewiringproducts.co.uk If you are going to use crimp on terminals, use the crimping tool for reliability though they say these terminals can also be soldered on.

You can wire most of the bike in 1 square mm cable, but certain wires are better being 2 square mm:

1) Battery to ammeter.
2) Ammeter to regulator terminal 'A'.
3) Battery to frame earth point.
4) Plus, if you choose to have an earth wire instead of using the frame, battery to headlamp.

[idie]

Connect the battery with the negative terminal to earth ie the free attach a wire to the field wire on the dynamo and flash the wire against the positive ie live terminal o the battery this will repolarise the dynamo to negative earth. If your mechanical regulator still works just connected back up. Regulator will work either way.

[Dan_B33]

Hello,
Many thanks for the instructions
Especially with wires dimensions.
I will likely buy cables and all need endings here.
Will stay with positive earth.
Will buy this DVR2 P regulator. Please if any of you knows better regulator make recommendation.

How abou battery casing?
This are Impossible to get here or are all very expensive If come from old Bosh batteries fro 50s.
Any particular type works for you guys?
I have seen two gel 6v batteries connected to a parallel cluster, which case supports that?

[Rog1]

I have a Motobatt MBT 6N6 AGM type battery for my M33. It works well and cost around £20-25 plus delivery. I suppose you could get two gel batteries linked in parallel, but at this price why bother? Of course my battery fits inside my dummy battery case, so you would have to check dimensions. My dummy battery case came with the bike, but they are fairly easy to find here in England.

[Dan_B33]

Thanks for sharing that hint Rog!
I will buy this rubber Lucas replica battery case and will see what I could get here in terms of battery.

Trying to resurrect old Lucas horn. I'm missing this securing bolt.
Anyone knows the size? See the picture

[Dan_B33]

Front of the horn for reference

[Dan_B33]

It makes sound now! Yupi!
Is that some 1/2" 26tpi thread?

[Dan_B33]

Fail! Dynamo stopped working.
I have no idea why?
I have noticed it was not straight forward setup.
See the picture. Someone have added separation brushes. Otherwise commutator is grounded. 0ohms between commutator and ground.
Then with separators tis is not the case and checked all the sections of armature. Same for adjustment sections resistance at 1.4 ohm . 180deg test reading 1.6ohm .

Other hints what to measure before I buy some refurbished from UK?

On the cover I see arrow clockwise. Clearly remember it produced voltage only when running anti-clockwise.

[neil1964]

You need to post a pic of how your wires are hooked up
Decide +ve or negative earth
You can reverse polarity by flashing it as needed

[Dan_B33]

Field wire i. The left is connected to F connector on bakelite cap.
Same side brush is connected to D connector.
Black wire on the right side coming from inside dynamo and right brush are connected to the ground.

Positive earth.
I gave checked with multimeter when it was working.

[Rog1]

You'll need to see if it's the dynamo or something else.

The Haynes manual says that to check the dynamo, connect the F and D terminals (connectors) together at the dynamo and attach the negative probe of a voltmeter to them. Attach the positive probe to the dynamo casing and start the bike. You should get 7-8 volts at a fast tickover if the dynamo's okay. Don't rev the engine as the voltage is unregulated and you could damage the dynamo.

The manual also says to check the dynamo armature is spinning; a loose driving pinion can give the impression of a faulty dynamo. Clockwise is the correct direction; had the dynamo been working up to now, while on the engine?