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try thisThe flasher relay might be a good first place to check since it regulates the on and off cycling of the turn signal Additional Input

There are at least a couple more possible cause for a rapid cyclic rate.

1. A high resistance ["partial"] short circuit in the circuit for the turn signals. Some examples being a wire pinched in a crevice in the sheet metal resulting in damage to the wire insulation allwing a very miniscule contact between the wire and the grounded sheet metal, or corrosion build up in one or all of the bulb sockets.

2. If a replacement bulb was the incorrect bulb, having a heavier filiment than the proper bulb, it would draw more current, possibly a lot, as the change of flash rate is dependent on current value. The heavier the filiment, the greater the current draw, the greater the current draw, the greater the flash rate.

3. Oh, there is another, but you didn't mention it, so it may not apply. The more bulbs which are on the circuit drawing current, the faster the rate. A very good example is when towing a trailer with lights plugged into your vehicle's light system. The additional "load" created by the larger number of bulb filiments burning, can cause the flash rate to be incredibly fast. For this problem, a "heavy duty" flasher module is made, and sold at most auto parts stores.

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โˆ™ 2012-08-04 22:40:15
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Q: What would cause a turn signal to blink fast?
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The new bulb is already burned out, not seated properly in its socket, or you replaced the wrong one. Get out and look at the signal lights while they are blinking fast. Either the front or rear light is not blinking at all. That is the one that needs to be replaced.

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The signal flasher relay may be on its way out.

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