battery power loss

[mustang429]

ok i hook up the battery and it drains it in a sec gos from 12.5 v to 8.5 and keeps going down

[facemelter71]

Check all exterior lighting when you hook up the battery.Make sure no dome lights are on,or that you have some thing running.Maybe a electric fan?
What led up to this? Just one day you walked out and it was dead?

[mustang429]

know drove it come back went in back out nothing but fix it the selnond was stuck open send power to the starter all the time thank you