I installed this one about 16 months ago. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
Just drilled the lid of the battery box with a hole saw and sealed with black RTV silicone. A short battery cable, connected ground to switch. All in for under $30. YMMV
__________________
Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
|