23 replies to this topic

[ToM 2012]

Hi I am changing from positive earth to negative earth. I have a negative earth electronic dizzy my battery has been changed round I want to use the Dynamo what was for positive earth I have been told by connecting the wires to this it will blow my dizzy. What do I need to do to get my battery to recharge and is there anything else I need to change around before I start blowing things? Currently got engine running but needs the charging system sorted any help would be great cheers Tom

[gazza82]

There are number of sites showing how. Think minimania is one. Probably a thread on here if you search.

Disconnect the distributor first though. Just in case ...

Edited by gazza82, 07 June 2016 - 07:42 PM.

[Northernpower]

This is how I did one a long time ago.

 

Connect the negative of the battery to the earth strap but don't at this stage connect up the positive. Remove both dynamo leads; the dynamo will still earth through the mounting brackets. Connect a length of cable to the positive side of the battery. Touch the other end of this cable briefly (enough to make a small spark) to the small terminal of the dynamo a few times. Your dynamo will now be repolarised. Connect the dynamo leads, connect the positive side of the battery and when you start up the ignition light will go out. What you are doing is reversing polarity of the small residual magnetism in the dynamo which is necessary to start it charging.

 

You may need to look at the heater motor, wiper motor, fuel pump etc.

Edited by Northernpower, 07 June 2016 - 08:03 PM.

[ToM 2012]

Thankyou just what I needed. before I connect my Dynamo I will test what out put I will be having should it be around 13 volts? Cheers Tom

[Northernpower]

No problem.

It should be, you will benefit from new brushes if you haven't already fitted some; make sure the springs that hold them in place are strong and more importantly make sure the gaps in the commutator are cleaned out.

[ToM 2012]

Are these areas inside the Dynamo? It's a brand new one from mini spares. Thanks Tom

[Northernpower]

Yes it is work to do inside, If its a new one you won't need to check.

Edited by Northernpower, 07 June 2016 - 08:57 PM.

[ToM 2012]

Ok cheers fingers crossed it works tomorrow cheers Tom

[ToM 2012]

Just need to find a big length of wire lol

[Northernpower]

Take the battery off and take it round to the front of the car. Connect the negative to the case of the dynamo and flash the positive to the terminal. That way you only need two short pieces of wire. Just make sure you have a real good earth otherwise it won't flash.

[ToM 2012]

Excellent cheers man

[ToM 2012]

Right I just flashed it and I have started it up and the Dynamo is only
Pushing out 00.3 I put earth of battery to cover and positive to the big connector? Have I done
It right? It was sparking blue cheers Tom

[ToM 2012]

The battery is getting 12.10 volts

[Northernpower]

Ideally you should have flashed the positive to the small terminal. It looks like you've got away with it.

[ToM 2012]

Is 12.10 volts enough charge tho? I might do it again so I put live wire from positive to big connector and a wire of negative battery to small connector? Cheers Tom