Had it on an Optimate but the battery was toast. The sled would start with a jumper pack. Went out and bought a new battery. Tried to jump from the new battery to the red/black leads. Once I hooked up the battery, there was a pop and now nothing works. Tore the sled down and put the new battery in. The fuel pump doesn’t prime, no lights on dash. I checked the 10 amp fuses off the battery box and they were fine. What should I look at next? Leaving on Thursday for a trip...this has me scrambling. Thanks in advance!