Greetings!

I cleaned the battery terminals on my 7.3 liter
Excursion this morning because I was getting a few false alarms in the middle of the night. I diagnosed the trouble and thought it might be current loss trigering the current draw module. Anyway, when I reconnected the batteries, the anti-theft light kept flashing. I tried three differnt keys, all programed, but the truck will not start. When I turn the key I hear a buzzing under the hood, then the theft light rapidly flashes. My Batteries are reading 18.5 on a voltmeter and I changed my cps. Still, the light flashes. Any help that you guys can render will be most appreciated.

Thanks!

KennyG

 

is that with the factory alarm system?it sounds like the alarm was tripped and u have to reset it.i may beable to help if its aftermarket.if its factory,than im useless.but im sure someone more knowledgable will chime in soon.

 

well, a couple things come to mind...

the buzzing noise... any idea what part of the engine compartment it's coming from? (bad ground at, or possible bad starter relay?)

actually, you could do a voltage drop test across any and all of the cables and cable connections... no more than .2v drop, otherwise you've got a bad cable or a bad connection...

bad (notice I didn't say "blown") fuse?

starter enable relay take a poopie?

Anti-theft module went sToOPid when you had the batteries disconnected?

 

The alarm is an add on module, the crimeguard al100 I think. Now the batteries are low, but the theft light still flashes.
Thanks for the replies. I'm standing by.

KennyG228

 

well, it takes millamps to run those bulbs vs. a couple hundred amps to turn the starter.

recharge the batteries and check your voltage drops.

while you're at it, try disconnecting power to the alarm and see what happens

 

belay that.

does this alarm have a key fob?

 

I would say your volt meter is wrong.. I don't think you can get 18.5 volts out of a 12 volt battery..
The most you can get is around 14.5 volts and that is with the engine running.

 

Check your fuel pump is working when you turn the key on. As far as I know if the dash THEFT light flashes it should be a factory system. I had a 1998 mustang did the same thing, was a loose wire, wouldn't let fuel pump run.

 

Do as JL Dickmon suggested, charge batts seperatley(unconnected, 1 at a time) go back and check all connections. I bet it starts in the morning after the batts are charged.
P.S. If you ever over near Millbrook/Prattville look me up.

 

Thanks for the feedback. I'll try again tommorow. The alarm is an add on to the factory keyless remote. I'll get the batteries charged and try again. Thnaks again for the feedback.

KennyG228

 

Thanks for all of the suggestions. I charged the batteries today and it started tonight with no reservations. I guess I'll go to Wal-Mart tommorow afternoon and replace the batteries. Thanks for all of your help!

KennyG228