The battery light comes on when I first turn the key on but goesout when the engine is running, the battery is new the P.O. replaced it several months before I bought the car, I wondering if it is bad connections or if it is a bad starter.
Is it possible to fit a group 31 stud battery under the hood in this car?

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'85 F250 6.9L diesel 2wd XL XC LB Centurion, Gone
'95 Mercedes E 300 Diesel W124.131 with a OM606.910 and just over 200k on the clock, needs top end engine work and a transmission.
2000 S500 W220 with a 5.0L V8 gas power.