Thanks for the replies....
Year is 2006 - it is a South African TJ Sahara, so maybe a little different to those in the States (they forgot to install ABS for example
). Engine temperatue was fine for whole episode. The temp on the rear-view mirror was +/-36 centigrade. Will have a look under the battery for the temp sensor there..
I checked the voltage off the alternator with the battery disconnected and it was showing a steady 14.84 volts at idle. How would I identify a bad regulator?