How to Troubleshoot 150W and 375W Inverters

Inspect the fuse in the rear of the inverter The 150W should have a 20A fuse, the 375W should have a 40A fuse Toggle the on/off switch back and forth three times Does the switch light up when turned on? The 150W does not have a fan but the 375W does - it should turn on Confirm "washer rule" - the washer should not be sandwiched between connectors