Please excuse my spelling errors on the pictures, as I do not have spellcheck on the editing software I use (gimp). Unfortunately, I realized this after I did not save a copy which would allow me to re-edit the instructions.
My defroster was not working. I did not hear a click from the relay when pressing the defrost button, so instead of paying $45.00 plus shipping for a new relay, I ordered two parts that I suspected were at fault. These were the radial 1 uf 65 Volt capacitor (blue) and the IC Timer (black rectangular chip).
Even before this, I did some basic troubleshooting--making sure that the spade terminal connectors snugly fit on both the relay and switch. These were loose, but I still did not hear the click of the relay engaging after this attempt. I even disassembled the defrost button and cleaned the contacts lightly with 180 grit sandpaper and electronic part cleaner. Still no click.
So, the next thing I did was to take the relay apart, and check the connections to see if any of the soldered joints were cracked or oxidized. They were. I repaired those, but again,no click.
On a hunch, I ordered http://www.digikey.com/product-search/e ... -2078-5-ND and this: http://www.digikey.com/product-search/e ... =EF2105-ND to replace the probably dried radial 1uf capacitor. The Polyester Metallized capacitor is a better choice because of its healing properties, and plus you do not have to worry about the polarity of the leads.
Once I carefully inspected the circuit for any faults, it was ready to be plugged in and tested. It worked! Hopefully this will do the trick for you as well if you find yourself without a rear defroster.
