Yes, there is reverse polarity protection as long as no other cables -- especially video -- are connected to the Bolt.
If video is connected it provides a ground path and can damage components on either the Bolt or external devices connected to the Bolt.
Always confirm proper polarity on your cables prior to use, damage caused from reverse polarity power cables is not covered under warranty.
When testing a cable, power on the Bolt with just the power cable connected and no other accessory cables.
- If the Bolt recognizes external power input (LED will illuminate) and powers on normally then the polarity should be correct.
- If the Bolt does not recognize the external power input through the corresponding LED and does not power on then the polarity may be incorrect, or the cable could have a separate issue.
Ideally, power cables should be assembled by a qualified technician and tested with a multimeter to confirm polarity.