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Step 17 - Replace 20 amp fuse under hood.
Step 18 - When amp turns on, LED will display red during diagnostic mode, and then green, signaling
amp is on and functioning. Amp will only turn on when radio is on.
Step 19 - Adjust gain.
Setting Gain
Turn gain knob on ThunderForm pre-amp to minimum, counter clockwise. Play a favorite song that
contains consistent music and bass. Turn the source unit to maximum listening level. You should
know that some source units will produce distortion or “clip” before the unit reaches maximum
volume. Reduce volume to the loudest listening level before distortion. Turn the gain knob on the
ThunderForm pre-amp clockwise until the speaker starts to distort and reduce gain to loudest
listening level before distortion.
Optional - The EBC, or Electronic Bass Control, allows a remote bass control to be adjusted from the
driver’s seat.
Troubleshooting Tips if Amp Does Not Turn On
• Check all connections at battery and that fuse is installed
• Check speaker wire connections
• Check ground
• Check fuse on pre-amp
Step 20 - Reinstall kick panel and threshold.
Step 21 - Using screws provided, install the enclosure into vehicle as shown below.
These instructions are guidelines only and in no way are intended to replace a professional
installation. As always before screwing or drilling check to make sure you will not damage any wires
or hoses or cause damage to the vehicle.
Warning: Batteries normally produce explosive gases which can cause personal injury. Therefore, do
not allow ames, sparks or lighted substances to come near the battery. When charging or working
near a battery, always shield your face and protect your eyes. Always provide ventilation.
