87'Tbird,I replaced alt.battery,cables&terminals,runs good,for 30mins.then beeps every 30 secs.then battery is dead.engine dies. Anybody have any ideas? Im stumped! 60.000 oring.miles

thanks....you've been magnanimous with your approval(s)~

Thanx,Judge Roy for the Help. I'll try it. God-Bless

You know "brown-outs" happen because the ground is of varying voltages and varying amperages...really tough for a computer to say Yes or No when critical issues are brought forth....though sensors...02 sensor, Manifold Pressure sensor...block temperature sensor~ https://www.google.com/search? biw=1309&bih=670&tbm=shop&sclient=psy- ab&q=1987+Ford+Thunderbird+block+coolant+temperature+sensor&oq= 1987+Ford+Thunderbird+block+coolant+temperature+sensor&gs_l=serp. 12...25757.27242.2.30184.8.8.0.0.0.0.131.830.3j5.8.0.crnk_timecombine d...0...1.1.32.psy-ab..8.0.0.1PkKSzbpa0U&pbx=1

not that you need a temperature sensor...but is a critical item for the computer to make important decisions on....and if it has a "semi-conductor" NOT solid steady ground to the battery might make a mistake....throw a Check Engine Light out there....any number of troubles~

I guess,I forgot to mention,I cleaned all grounds,(wire-brushed),checked for open circuits,none found,no-eng. Lite on.not over-heating,just not keeping a charge.

Check for fusible links. Also there was a recall for the alternator wiring harness. Mine caught fire because of this...we were also chasing a dead batt/alt problem during this time

Thanx,Rusty,I'ts the answer i was looking for,makes sense, Do you think,Ford,will hook-me up with a Harness? Or? God-Bless Bro.

Happy Holiday's to Everyone!!!!!

I'm sure you can find it at the Ford dealer shouldn't cost too much

Im curious,Did you fix,The problem You was having?

yes well it was kind of obvious once the car caught on fire and the harness was burned up