I got some great advice from a member on another site. I bought the Rotunda #328-00008 Antifreeze Coolant ELC Contamination Kit and did the testing tonight. Everything worked out great and the coolant in both radiators tested fine. I highly recommend removing the grill assembly as it allows better access to the passenger side petcock. Due to the awkward, front facing, position of the petcock "release knob" I could not turn it past the first 90 degrees by hand. Otherwise not too bad. It would be nice to make a wrench short enough to be able to turn it while under the truck. Next time I will be more prepared.
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