> Interesting. I'll have to breadboard that and try it. I presume you are
> referring to connecting an N-channel and a P-channel in series? If so, wh=
at
> turns on the N-channel fet, if the gate voltage switches between 0 and th=
e
> alternator voltage?
>=20
> I've never seen this configuration - can you point me to a reference
> somewhere?

No you use two identical FETs, connected so the drain source diodes are opp=
osite polarity.=20

I am sure that someone has posted a circuit on this before, using this conf=
iguration, but I don't have a schematic handy.

However a quick search on Google produced these links ...

https://forum.allaboutcircuits.com/showthread.php?t=3D60465 which shows the=
 basic circuit fairly well down the page.

And this one ...
http://easy-electronics4u.blogspot.co.uk/2012/02/switch-ac-loads-using-mosf=
ets-as-relay.html

which uses an opto-isolator to drive them, but you should be able to drive =
the gates directly.


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