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AMPLIFIERS
6
1. Fuses - For convenience, all amplifiers utilize ATC type fuses. For continued protection in the event that a
fuse blows, replace the fuse only with the same value.
Caution: The power fuses on the amp are for protecting the amp against overdrive. To protect the vehicle’s
electrical system, an additional fuse is required within 18" of the battery on the 12V+ cable.
Thunder4122 – 20 Amp
Thunder4202 – 30 Amp
Thunder4244 – 25 Amp x 2
2. Power Terminal – This is the main power input for the amplifier and must be connected direct-
ly to the positive terminal of the car battery for the amplifier to operate properly. See the chart
below for recommended cable sizes for each amplifier. Use caution when running this cable
through the car. Try to avoid the input RCA cables, antenna cabling, or other sensitive equipment
as the large amount of current flowing through this cable can induce noise into your system. It is
also very important to have a tight connection to ensure maximum performance.
Thunder4122 – 10 Gauge
Thunder4202 – 10 Gauge
Thunder4244 – 8 Gauge
3. Ground Terminal – A good quality ground is required for your Thunder Amplifier to operate at
peak performance. A short length of cable the same gauge as your power cable should be used
to attach the ground terminal directly to the chassis of the car. Always scrape or sand any paint-
ed surfaces to expose bare metal where the ground wire will attach.
4. Remote Terminal – All Thunder Amplifiers can be turned on by applying 12 volts to this termi-
nal. Typically this voltage is supplied by a wire from the source unit marked “remote” or “electric
antenna”.
5. Speaker Terminals – As shown in the wiring diagrams, be sure to observe speaker polarity
through the system. Failing to wire the speakers in proper phase could result in a loss of bass
response and/or poor overall sound quality. Caution: Thunder amplifiers are not recommended for
loads below 2 ohms stereo or 4 ohms bridged.
6. Power LED (top of heatsink)-
A lighted LED indicates that power has been applied to the amplifier. +12V
from the battery to the +BATT terminal (#10) and +12V from a switched ignition or remote lead from a head
unit. An unlighted LED indicates power has been removed or the amplifier has overheated. In the case of
the overheat condition, the amplifier will turn back on after it cools down.
Output Panel Layout
❶
❺
❷
❶
❹
❸
❺
❶
❷
❹
❸
❷
❹
❸
❺