Aftermarket headlight relays were a VERY popular addition to cars in the 1940's and 50's, particularly on 6 volt systems with slightly corroded connectors and rusty ground circuits. Dad's mechanics installed dozens of them durng that time. People were amazed at how much brighter their headlights got. I'm sure a few of our peers and subordinates are glad some of us are retired now.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!