battery or alt

[LILT]

when I drive my car at night the dash board lights are dim at idle but bright when I pick up speed is it the battery or alt. did a 69 come with a top mount battery or side mount

[IZRSSS]

I'd have to say the alternator. But, Check belts, pulley & all charging elements including the battery. If all checks out you can run these series of tests on your alternator;

http://www.wikihow.com/Check-an-Alternator

Batteries;

http://www.camaros.org/underhood.shtml#Batteries

[canadair]

while the car is running discionnect the battery cable the alternator should keep the car running late production cars mine is Oct 69 and has side terminals                                                                                                           

[vtfb68]

Also check your voltage regulator.
  VT