Optimus 120-2180 manual one of the supplied fuses. Check both fuses

one of the supplied fuses. Check both fuses.

WARNING: Before you begin, disconnect the cable from the vehicle battery's negative (-) terminal.

1.Unlatch the two latches on the fuse holder so the holder springs open.

2.If either fuse is blown, replace it. Use only standard 1 1/4-inch fuses with the proper rating. The red power wire's fuse must be 1.0 amp, and the yellow continuous power wire's fuse must be 2.0 amps.

CAUTION: The supplied spare fuses have the proper ratings. Make sure you replace a fuse only with another fuse of the same rating.

3.Reassemble the fuse holder only squeezing it together.

4.Reconnect the cable to the vehicle battery's negative (-) terminal.