I am considering installing relays on the main power wires to the headlight motors........So they are only juiced when the car is on......I have some 30 amp relays.....Would they be big enough?

The headlamp motor relay is rated at 20 Amp. That should give you a starting point.

Thank you for the answer....I did not take out one of the relays and examine it.........

Not all relay coils like being on all the time or even on for hours and quickly "wear out."
Most relay don't have diodes unlike fuel pump and other relays used by automotive industries. Coil diodes kill the surge when power to it is cut.
Catalogs FSM and other places don't show them in most wiring doc's but nearly all car relays have diode(s) in the relay case.

If you really want to use relays... cut wires between C & D fuse links and OE relays. Not the links or splices to them.

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

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