Thanks, I stole the heated water idea from the T-Rat forum, was sure glad to see the thing go open circuit with a raise in temp, just to reconfirm my test was accurate. Now to get a new pickup - appear to be backordered until May 30th..... Anyone know a dealer offhand with a big inventory? Haven't had any luck with the 3 I've tried (2 local and 1 in Jersey).