85 LeSabre R Wind Def Switch?

One day last week I met a dude at Chevy with a derelict of an 85 LeSabre 2 door.
Anyway
The guy bought a the plastic chrome plated push on knob that slides over
the end of the rear window defrost swith - lever. There is a yellow light that shines through the switch - lever & knob when the defroster is turned on.
With the ignition off, when he would press and hold the spring loaded defroster lever to the ON position, the light would go on, then went off when it was released.
His question to me was should the light be going on when the lever is pushed to ON while the ignition is off?
I couldn't give him an answer, not that it really matters, but it is intriging.
========Harryface ======== 1991 Pontiac Bonneville LE 3800 V6 ( C ), Black/Slate Grey _~_~_~297,188 miles_~_~_
~_~_~_~_U.S.A._~_~_~_~_~_
~~~The Former Fleet ~~~ 89 Cavalier Z 24 convertible 78 Holiday 88 coupe 68 LeSabre convertible 73 Impala sedan
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My 88 Celebrity does the same thing, if you hold the switch in the on posistion with the ignition off, the light turns on. I have no idea if that actually turns on the defroster too.
-Sam
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