What causes the indicator to indicate fast ?"

Test the bulbs with a meter. Fast flashing is indicative of load missing from the circuit. When bulbs are in use the filaments become brittle. My guess is that when you took them out and tossed them the filaments broke. If the indicators are flashing then it isn't the fuse.

This could be caused by a direct short circuit on the speaker outputs. Try disconnecting all the speaker connections at the back of the receiver and then power back on. You can also try a factory reset by holding the surround mode + clear button for 3 seconds.

Fast flashing indicates a bulb faulty. Check for side indicators as well.

well it can be improper contact or if its flashing fster than usual check all other indicator light if they are working and all the bulbs are not burnt, i can bet you , failure of the other makes ur indicator flash fast

blinking fast indicates a bad bulb on that side. try front and back bulbs

the indicator usually ony flashes fast when one of the indicators on the same side is blown, check the other indicators, should only be a blown globe, defroster should be a fuse =)

Flashing too fast indicates too much current flowing and this would point to a bad bulb or shorted socket. Maybe a grounded wire in the circuit. Check these items with a DVM....

Check there are no faulty bulbs on the indicator circuits, and that all bulbs are of the correct wattage.
(Water in a lamp connector can also cause erratic indicator operation due electrolysis/corrosion).
Check alternator running / battery operating voltage does not exceed 14.5V.

this is usually caused by rthe relay either being faulty or the wrong one? i have seen this before when one of your bulbs is out but only on quite old cars with basic wiring looms. i would replace relay under the bonnet/ in the cockpit (refer to owners manual for location)

bad bulb..ground to fast side is corroded or socket/ bulb compromised