Chevrolet was the original sponsor of "My Three Sons";
in fact it sponsored three shows in the Thursday 9 PM
slot on ABC between 1957 and 1967: "The Pat Boone
Chevy Showroon," "My Three Sons," and "Bewitched."
One reason I've heard that "My Three Sons" moved to
CBS was that Hunt's had taken over sponsorship and
wanted their commercials in color, which ABC didn't
offer them.
"Bonanza" was sponsored by RCA when it originally
aired on Saturdays (the show was in color in part to
sell RCA color sets); Chevrolet took over when it moved
to Sundays in 1961, inheriting Dinah Shore's time slot
and sponsor ("See the USA in your Chevrolet...").
"The FBI" was sponsored by Ford, and all the FBI agents
drove Fords.
And who can forget Ronald Reagan as spokesperson for
General Electric on "GE Theater," or Alfred Hitchcock's
sardonic lead-ins to Bristol-Myers commercials on his
show?
A few others that come to mind:
You Bet Your Life: DeSoto/Plymouth dealers (at least
until 1958)
The Jack Benny Program: Lucky Strike until 1960, then
State Farm Insurance
Maverick: Kaiser Aluminum
Lassie: Campbell Soups
The Millionaire: Colgate-Palmolive
I've Got A Secret: Winston cigarettes in the '50s,
General Foods in the '60s
To Tell The Truth: Marlboro cigarettes and Geritol
The Lawrence Welk Show: Dodge in the '50s, Geritol
thereafter
The Ed Sullivan Show: Lincoln-Mercury, Revlon, and
Kent cigarettes (those are the ones I remember)
Arthur Godfrey: Lipton Tea sponsored Talent Scouts
on Mondays, Chesterfield cigarettes sponsored Godfrey
And His Friends on Wednesdays
Boxing (1950s): Pabst Blue Ribbon beer on Wednesdays,
Gillette on Fridays
Ted Mack's Amateur Hour: Old Gold cigarettes (which sponsored
a number of game shows like Two For The Money), Pet Milk,
Hazel Bishop cosmetics (also sponsored This Is Your Life), and--
of course--Geritol
Burns and Allen had an alternate sponsor to Carnation: B.F.
Goodrich tires
And does anyone remember who replaced Texaco as Milton
Berle's sponsor? It was Buick, and the show was renamed
The Buick-Berle Show. In 1955 Buick switched its sponsorship
to Gleason.
There have also been soaps owned by companies other than
Procter & Gamble; for instance, American Home Products owned
Love Of Life and The Secret Storm (eventually making a fatal
mistake selling the latter to CBS), while Colgate-Palmolive owned
The Doctors.
Although the quiz scandals have often been cited as the
reason for the move away from full sponsorship, the main
reason is simply economics: escalating production costs
made it almost impossible for one company to sponsor an
entire show every week.