This was interesting.
"The Dodge Brothers logo has been extensively discussed in the Dodge Brothers Club newsletter, which notes that in 1938, an export version with a single black triangle was used, and shortly afterwards, the Star-of-David logo disappeared completely. David Zimmerman wrote that he suspected that the Dodge Brothers may have believed that certain export markets would not buy a car with the link to the Jewish symbol.
The Dodge Brothers Club's FAQ states that the symbol was not chosen to anger Henry Ford, and goes on to say that "At the time the emblem was selected (most likely 1912-1914) it's likely that the Dodge brothers were unaware of its use in Judiasm. In fact, at this time, that symbol was not used universally in this context." It suggests these possibilities, among others:
1. These are two interlocking Greek letter "deltas" or "Ds" for the two Dodge brothers
2. A midieval symbol of mysticism and the joining of mind and body, also possibly the joining of two brothers, who were known to be personally very close, in this business venture.
3. An abstraction of the square and compass of the Freemasons.
4. Nothing more or less than a badge with six pointed star similar to those used for law-enforcement officer's badges, some outlined with triangles. Sheriff, Marshall, and police badges frequently were and are six pointed stars. The old-west Dodge City badge had six points. Horace Dodge was said to enjoy accompanying local law-enforcement officers on their runs.
The Dodge Brothers Club News editor wrote that "emblem is also a "Solomon’s Seal" sign of interconnected spirits, as the brothers were." The source for the FAQ information on this topic appears to be Dodge Bros, the men, the motorcars, the legacy, by Charles K. Hyde, Wayne State University Press, 2004."