Lumpy then no start a few days after dynamo to alternator conversion

[Rosemore]

Hi all, I thought I had successfully completed a dynamo to alternator conversion and everything was running smoothly for a few days. Then Friday morning, I had to turn back home as things were really really lumpy, rough driving and couldn't reach the top of the road. I got home though but now the car won't start. Lights come on and I hear the petrol pump with the usual starting sounds but the engine doesn't kick off. I'll check for a spark soon. I've ordered a coil just in case.

They advise you to connect one of the wires to the chassis for negative which I did but I may not have had a good connection. Could that have damaged anything? What's the best way to troubleshoot? Thanks in advance.

[philthehill]

Just to clarify is it a alternator to dynamo conversion (as stated above in the thread) or a dynamo to alternator conversion as per title of the thread?
I do not know what wiring diagram you are using but the diagram as shown below is the one I use:-

alternator wiring diagram.jpg (407.64 KiB) Viewed 5500 times

[Rosemore]

Thank you. Problem solved, it was the cable leading to the coil. Yeah it was dynamo to alternator.
Thanks for your diagram, I connected all four cables on the first two junctions, A and A1 together.

[geoberni]

Are you actually saying you went to all the trouble of reversing an Alternator conversion, just because it started to run rough after a few days??

The fact they you've said

I'll check for a spark soon. I've ordered a coil just in case.

Just makes me go...

Why do the latter without the former.....
Checking for a spark is easy.
Why spend £20 on a coil, 'just in case'... ????

[Rosemore]

Are you actually saying you went to all the trouble of reversing an Alternator conversion, just because it started to run rough after a few days??

Nooo, still with the alternator. I figured it might be the coil as it was so lumpy, I didn't want to be without. I can return it, Amazon prime

[geoberni]

Are you actually saying you went to all the trouble of reversing an Alternator conversion, just because it started to run rough after a few days??

Nooo, still with the alternator. I figured it might be the coil as it was so lumpy, I didn't want to be without. I can return it, Amazon prime

Sorry, just me misreading the first part...