2004 Nissan Frontier Owner's Manual - Page 185
2004 Nissan Frontier Manual
Page 185 highlights
WARNING Do not use your heater with an ungrounded electrical system or twopronged (cheater) adapters. You can be injured by an electrical shock if you use an ungrounded connection. Starting and driving 5-33
WARNING
Do not use your heater with an un-
grounded electrical system or two-
pronged (cheater) adapters. You can be
injuredbyanelectricalshockifyouusean
ungroundedconnection.
Starting and driving
5-33