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93 Park Ave Ultra any route for 2/0 welding cable through firewall

Wiring, Electrical and Installation Help - www.caraudio.com
Hey guys! Newbie here!

This 1993 Buick Park Avenue Ultra already had serious grounding/electrical issues that had to be rectified before a system upgrade could be considered. Purchased a 34/78 Northstar AGM deep cycle battery, 2/0 welders cable, tinned copper terminals, heat shrink tubing, 16ton hydraulic crimper, 220A DB Electric alternator and just completed the Big 4 with substantial improvements. Battery voltage at 12.8V and holds at 14.8V with full electrical load at highway speed.

Need to run 2/0 cable preferably through firewall and passenger door trim to trunk. There are body rust issues along the fuel lines where one would tie clip a power wire beneath the vehicle that have to be addressed in the future so it would be foolish to run wire outside at this time.

Hoping to run two 2/0 power lines. The first to power a 1000W inverter mounted on the floor hump between driver and passenger seats. The second run to the trunk to power two deep cycle batteries which will be installed in the spare tire pit.

Opened the dash and removed the glove box hoping to get access to what seemed to be grommets on the upper firewall.

The battery as shown above is situated on the passenger side and there are grommets (well better call them electrical junctions) on the firewall side. The space beneath these grommets is difficult to reach due to the a/c accumulator and related piping but seems the only choice. Can't find any other "grommet" type connection on the passenger side.

Any advise would be much appreciated.

Thanks!
Date: Jan 13, 2018   


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