Separate heater and blower

[Jonny Hart]

Looks like a neat solution Jonny, but is there something wrong with the maths?
Alternators are rated at Amps, so yours will be 75 Amp, enough to theoretically provide 900 Watts (12 x 75). Or am I missing something? Your heater elements are only using 60 Watts, same as one headlight bulb

Sorry, typo - yes Amps. And me an EE, should pay more attention! I'll go and do my corrections....

420W heater = 35 Amps (@ 12 v)

[stevesprite]

A shearling flying jacket and a chamois leather is all you need

[bonerp]

Those cbs things are crap. Get a heated screen. I've never used mine but it's there for the iva and is invisible compared to vents from cbs which are fugly as hell.