I wrote an application note about this (not for automobiles) here:
http://www.trainweb.org/s-trains/diagram/handcar_diode_hrm.htm
== Alex in Maine
1960 BT7 3000 Mark 1 - "The Blue Mainie"
Former owner of 1957 100-6, and 1967 3000 Mark III BJ8
http://users.adelphia.net/~alexmm/ai2q.htm
----- Original Message -----
From: Dave & M
To: Bob Spidell
Cc: Earl Kagna ; jrhill ; Healey List
Sent: Thursday, September 15, 2005 6:35 PM
Subject: Re: heater fan sucks
Hi Bob,
Better check out the theory & trace out the paths first. The full wave
bridge is a common way to make a DC device non polarity sensitive.
Steering diodes would be another description.
Dave Russell
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