The SPR-200 consists of a BG12 battery guard and a PAC-200 relay which will isolate the primary battery from the secondary battery.
• Great for isolating two different brand or age of batteries.
• Prevents a dead starting battery when listening to stereo with engine off.
• Gives you visual indication of a bad charging system before you get stranded.
• Disconnects the second battery when voltage drops below 11.6v!
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