97 Chevy Tahoe power cord under hood
I thought my 97 Tahoe had a block heater with the
plug resting just inside the front grill. But after
looking closer, the cord runs to a small black box
about 3" tall x 5" wide x 1" thick. The box is
mounted within 1/2 of my battery. It has 2 thin
wires coming put of it. 1 red that goes to positive
battery post and 1 black that is screwed to right
fender. When i plug in a small green & red light
come on. The labeling is worn so I can't make out
anything written on it. Any ideas?