Dc50 issues

[AdamF]

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First issue I have is that the head will not work.
 I have got power down to the head connection but having bought a new head and connected it it failed to work .
 So Im stumped on why so took the switch assembley apart and now cant get the two springs to seat correctley does any one have any advise on how to resolve the issues im encountering.

Kind regards
 Adam

[MVacs]

What voltage do you have at the socket where the head plugs in?