door popper back up

hi,

i'd forgo the battery backup for the poppers.  if it fails, you still won't get in the vehicle.  don't believe a 9V battery will supply enough current to activate one anyways.  the 520T might but you'd if it goes dead then well..

does you car have a trunk, without the lock shaved.  if yes, then route wire(s) from the outputs of the relays to there.

if no, then make a post accessible beneath the vehicle somewhere.  use a grommet as an insulator.  stainless machine thread screw with a ring terminal attached with a nut to it.  pass screw through grommet (washers on each side to compress evenly) .  secure in place with locking hardware.  route the wire on the ring terminal to the output of your relay.  using jumper cables attach negative to frame, tap positive to post you just added..voila door opens

m