dynamo headache

[matthewcoxall12]

i will tell the story as i know it and be aware i have about 1% electrical knowledge just what i have picked up along the way
this is a picture of the wiring set-up i have on my Lister d now this set-up has been tested and i ran a 240 v drill and then a 240 sander with the voltage meter decreasing at a very very very slow pace nothing to be worried about for a day rally so i thought great lots of power i was not going to complain about where it was coming from (as its a 12v dynamo attached to a 12v battery running a 240 drill at full speed) anyway i picked up one of those old spinning police lights the other day at the boot sale and i thought i would give it a test on the dynamo so i wired it up as all i got was a tiny little glow from the bulb and the thing was not spinning. thinking the light was broke i got out the 12v power pack and tested it and away it went perfectly so attached it back up to the dynamo and the same only a tiny glow from bulb and no spinning so my question is how can my dynamo produce enough power to run my drill and sander but not enough power to run a 12v light

 

[matthewcoxall12]

the drill and sander are new not old and i did try the light on the red and blue wire that goes into the plug the same red and blue wire that runs the drill through the plug

 

[matthewcoxall12]

so after all the agro i have been having i wanted to really put the dynamo to the test and the results are in the video

[video=youtube;f9zdbZN2hmE]http://www.youtube.com/watch?v=f9zdbZN2hmE[/video]

the little 12v battery voltage droped but my car battery held its voltage till i turned the engine off did not drop at all for the whole hour i ran the engine

 

[Lighthouse Phil]

What voltage do you get across the alternator / dynamo ??
Put the test leads where you have the red and black lead froming from it, without the battery connected. I think what you have there is a small 220V alternator, the battery is exciting the stator windings, which is why it drains down after a while.

on another note, is that a lister water pump on the top right of the video?

 

[matthewcoxall12]

yes i think you might be right i think he covered it himself some how i know it use to be a dynamo

and it a climax well pump head will be shown with the engine cheers