heated mirrors on 04 tipper not working

[wet gardener]

The heated part of the mirrors stopped working a while back winters upon us now and they are badly needed,the relay is fine(r22) fuse is fine (f63 Haynes) switch is fine,mirrors good,checked everything on my 06 lwb,I press the button to heat the mirrors, no joy the relay doesn't click,so I'm assuming its either a bad earth or a break in the power , where to look????? Me head's fried,any help much appreciated

[Altransit]

F217 & R22 according to this:-

viewtopic.php?f=40&t=71739

Probably best to check every fuse anyway, Ford are well known for changing the fuse locations

[wet gardener]

Unfortunately all fuses are good, damn I hate electrics

[loot]

Take the case off the relay and manually flip the contacts and see if the mirrors heat up, if they do then the fault is at the low voltage switch side, either the switch or earth to it, if you get stuck you can easily make a switch to get you out of the doodoo,