1991 mustang gt will turn over with no key

Hey! :wavey

I dont really think you will have a bad parasitic load just from the ignition column like that. It just seems like your key tumblers just deteriorated from 23 years lol.

I would put my money on the old crappy battery. Did you leave the new battery hooked up overnight at all? If not, try that a few days and see if you have a problem. Otherwise, check to make sure all of the interior components are off (radio, windows, etc) when you shut the car off. Other than that, check out all of your electrical components on the inside and make sure they work, including the blower fan. The blower fan sometimes becomes a parasitic load if the clip burns out and fuses the leads together.

Good luck!

mustangcorvette said:

question for ya I have a 1991 mustang gt comvertible my ignition turns without a key last time it was on the road about 2010 if it sat over night id need a jump start every morning this was with a used auto wrecker battry since then I have bought a new battery but kept it un hooked and only hooked it up to idle the car once a month im putting it back on road in next couple months could the fact that it turns without a key be draining the battery ? I am planning to fix the issue but just wondering if I should look elsewhere for the battery drain issue

Click to expand...

The lock cylinder is probably not your problem .
the best way to check for parasitic drain is
connect an ammeter in series with the battery's
neg terminal and the neg cable. If the ammeter
reads between 25 and 50 milliamps then there is
too much drain. You can start to narrow it down
by unplugging things one at a time and check meter
to see any drop in current.

squekster said:

The lock cylinder is probably not your problem .
the best way to check for parasitic drain is
connect an ammeter in series with the battery's
neg terminal and the neg cable. If the ammeter
reads between 25 and 50 milliamps then there is
too much drain. You can start to narrow it down
by unplugging things one at a time and check meter
to see any drop in current.

Click to expand...

This is the best solution and for peace of mind unplug the harness to the ignition first and that will eliminate the cylinder as a possible issue.