Power pack question

[cehmass]

"just had one go, shortly afte

"just had one go, shortly after new pack was installed,the other one let go . is this common.
now have two new packs.{e90tlcur}"

 

[jwbmarine]

"make sure,.....u have no volt

"make sure,.....u have no voltage,on blk/yellow wire w/key on...and ck out electronics by the book..."