How can I bridge a Rockwood Model No. AMP326 4ch amp?

Rockwood was a very low level brand. Alot of their amps were not brigeable. If bridge able the bridge terminals should be marked (usually the positive of 1 channel and the negative of the other channel). Under no circumstances bridge to less than a 4 ohm load.

the 3rd wire grounds to the bridge

with a maximum of 700 watts, it would need a 60 amp fuse

Check an make sure your fuse is tight the one coming off the battery for your amp if that dosnt work try grounding your amp to the battery to make sure the ground is good

Rockwood AMP-5556 - Amplifier - 4-channel - 200 Watts x 4

Well if it's a multi channel amp it can definately be bridged. Yes, and from what I've read it is actually bridgeable at 2 ohms per 2 channels.

30 amp fuse will work

i would recomend 8gage just to be safe

on the left channel (R+) on the right channel (L-) to create a bridge

Hello william_pric,

Look on the speaker output terminals to see if there is an indication, usually a line between the positive (+) on one to the negative (-) on the other, with the word "bridged". If the bridging terminals are not indicated, you can always try one of the positives and the other negative. If there's no sound, it must be the other two terminals. Just be careful that you don't short the terminals, and don't crank the volume up without the sub connected. Some amps don't like an infinite load.

For an input to the amp from a stock OEM radio, your best solution is to use a "line out converter", connected to the rear speaker wires. The PAC SNI-45T shown in the link is one such device. This one includes a "remote turn-on" lead for the amp. You could use a cheaper LOC and just run 12V from an accessory lead on the truck. In this case, the amp will turn on and stay on whenever the ignition switch is in the "on" or "accessories" position. If this is objectionable, mount a SPST switch somewhere convenient and wire the turn-on wire through it.

Hope this helps.