Help with my Indicators/signals

I have a 03 954 and it didn't have side lights the little lights you plunge into the top of the headlight, so i removed the stock indicators and fitted the into the headlights inplace of these sidelights, They worked fine/ steady rate of flas, Today I removed the rear fender and Indicators I then fitted smaller indicators and tested them, now both front and back flash at a much faster speed, I would have expected this if i fiited LED's but their not the bulbs are the same VOLTAGE & WATTS as the front, I then took of one of the rear indicators and put back the stock one's and the flash rate returned to mormal,but their all the same bulbs, MY HEAD IS MELTED,
Is their some difference other than whats stamped on the bulb because I can't understand why I'm getting two different flash speeds,
Any help welcome Thanks

Maybe one of the elements is out in one of the bulbs

Originally Posted by JSquier

Maybe one of the elements is out in one of the bulbs

Nah i tried 4 different bulbs and still the same

have you tried using a ballast resistor? I know that 2 came with my aftermarket rear lights.

Originally Posted by tiny

have you tried using a ballast resistor? I know that 2 came with my aftermarket rear lights.

I tried two different types but then again i could be setting them up wrong, I'm getting a new relay for it today so hopefully that works, just need to find the bloody thing