Help Removing Wire Terminal Covers

First the wires have to be removed from the connectors on the circuit board. Then you need to slip a tool like this one in between the insulator and the connector:

http://www.amazon.com/Lisle-56500-Terminal-Tool/dp/B0009OR906

In the case of a normal female spade connector enter the connector from the open end with the appropriate flat blade between the solid side of the connector and the insulator. There's a tang on the back (solid) side that faces toward the wire.

If it has round connectors in the plug slip the appropriate size round blade over the metal connector. Then slide the insulator off the wire.

Here's a link to a picture of a round connector. Note the rear facing barbs. These are the ones the tool slips over and collapses so the insulator can be removed:

http://www.delcity.net/store/Weather-Pack-Terminals/p_797654.h_797655.t_1.r_IF1003?mkwid=sRazW8Uie&crid=38094426869&mp_kw=&mp_mt=&gclid=CLrBq73cwssCFZKGaQodprEJUw

Here's a link to a catalog page with pictures of various style connectors. Note each style has some sort of rear facing tang that must be collapsed to remove it from the insulator:

http://www.clipsandfasteners.com/v/vspfiles/assets/images/auveco_catalog155.pdf

There are a number of individual tools that can be used, but the one in the first link covers the entire range of connectors.