how do you test a 6V dynamo? (not stag related)

[Rubce]

Hi AllDo any of you have experience of testing a 6V dynamo? My brothers GMC352 artillery truck is struggling to start. Battery keeps going flat. It shows 6V so want to test the dyno.ThanksBruce

[V Mad]

Testing is much the same as testing an alternator on the car; start engine, put on some heavy load (headlights etc) then rev up and make sure voltage goes up above 'normal' battery voltage (6v fully charged lead/acid is about 6.5v.).

Dynamos have an external control box; this has a cutout relay (no diodes!) and a regulator to control voltage (and sometimes current). Sometimes the cutouts dont pull in when charging so there is no charge into the battery, so contacts may need cleaning.

[Danny]

Hi,
This might help, http://www.venselenterprises.com/tec...generators.pdf

my 1953 Anglia "Sit up and beg" has a 6v generator,

Danny

[Rubce]

Hi Guys. Thanks for the info. I have passed it onto my brother so hopefully he will soon have his truck back on the road creating traffic jams in Cambridgeshire!! Regards Bruce