I assume you have an Isuzu 4BD1/2. A lot of them cam with a factory block heater that screw into the block on the left side. The simplest would be to buy one from your local dealer or from Tom's http://stores.ebay.com/Toms-Truck-Center-Suzuki-Kia-Depot. Often, they are available as a kit and include the wiring harness.
Actually, considering where you are located, I'm surprised that you are having trouble starting.