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The only place left to mount the Painless 100-amp solenoid was on the inside of the firewall. So we removed the main battery and drilled some holes, being careful not to drill into any other wires on the back side. The bolts are inserted from the engine compartment, so the bolt won’t protrude into the case of the battery.
Dual Batteries for Any Vehicle

The only place left to mount the Painless 100-amp solenoid was on the inside of the firewall. So we removed the main battery and drilled some holes, being careful not to drill into any other wires on the back side. The bolts are inserted from the engine compartment, so the bolt won’t protrude into the case of the battery.  View Related Article