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 12Vt cable.
Thunder6152 - 30A
Thunder6304 - 25A x 3
Thunder8302 - 30A x 2
2. PowerTerminal - This terminal is where the power source of the vehicle is connected. The 12Vt must be connected
directly to the positive battery post. It is highly recommended that you place an additional fuse within 18” of the bat-
tery connection. Be sure to use the correct gauge of power cable! If wire of insufficient size is used, there will be a
voltage drop and the amp will starve, causing poor performance. In an extreme case, the amp may shut down due to
the low battery voltage protection feature. The terminal closest to the fuse(s) is where the power cable with con-
nector should be installed. Be sure to make your connection clean to avoid any shorting to the other terminals.
Always double check all of the connections for any discrepancies.
Thunder6152- 10 Gauge
Thunder6304 - 6 - 8 Gauge
Thunder8302 - 8 Gauge
3. Remote Terminal - This is the wire that turns the amplifier on and off. This terminal connects to the amp turn-on
lead or the power antenna lead coming from the source unit. If the source unit doesn’t have one of these wires, you
can either run a wire to the battery with a switch or use an ignition controlled wire to power up the amp. If you use
the ignition controlled wire, be aware that the amplifier will be on, as long as the car is on. When using the Smart
EngageTMfeature, a high powered radio, and speaker level inputs it is not necessary to connectthe Remote Terminal.
4. Ground Terminal - The ground terminal connects the amplifier to the vehicle ground. Be sure to use the same size
wire gauge or larger as the t12V connection. A strong ground point is very important. A little screw through the body
is not acceptable. The cable should be as short as possible and connected to the chassis of the vehicle. The contact
point should be free of paint and debris for best results. All precautions for the 12Vt connection apply to this con-
nection as well.
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.
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