Radio Shack 120-2182 - Manual (Page 21)

replace the fuse from one or more of the power wires with one of the
supplied fuses. Check all fuses.
The fuse for the yellow power wire on the CD changer must be 5.0 amps. On
the Audio Adapter, the red power wire's fuse should be 0.5 amps, while the
yellow continuous power wire's fuse must be 5 amps.
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 a fuse is blown, replace it. Use only standard 1-1/4 inch fuses
with the proper rating.
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 by squeezing it together.
4. Reconnect the cable to the vehicle battery's negative (-) terminal.