Originally Posted by dshealey
Reverse your 85/86 connections! The way it is drawn, you will produce a dead short through the relay diodes. The battery positive lines should be to the "bar" side of the diodes.
Just realized that if anyone reads this out of context it could be confusing.
In the use stated, the battery positive should be to the "bar" side of the diode. The purpose of the diodes in the relays is not to protect the relay, but any coil control circuit. The function is to short the "kick back" voltage induced in the coil when the voltage is removed, that way it does not kick back into sensitive control circuits. The kick back voltage can be pretty high. These are often called "free wheeling" diodes.
In other circuits, such as rectification or "steering" use of diodes, then positive would often attach to the "arrow" side of the diode, not the "bar".
In use, current will flow positive to negative in the "Arrow" direction, and be blocked if the polarity is reversed.
There are those who will point out that "electron flow" is from negative to positive, which is actually correct. However when most people talk abut current flow, they are using "Conventional Flow", not "Electron Flow". Benjamin Franklin assumed that current flowed positive to negative, so that is what most people use when speaking of current flow to this day.