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You may have replaced the bulbs with improper alignment as they only go in one proper way. Try replacing them again. One retention pin is lower that the other.
If the arrow lights up but doesn't blink, first check all bulbs on front,side & rear. Turn on other side that works & refer to all working bulbs on that side. Most likely one is burned out. If all bulbs are lit like on other side but still wont function, flasher unit is bad.
Two things I'd look at there...First, though it does not often happen, I'd check all turn signal bulbs to make sure that one of the filaments have not burned and re-connected themselves to the adjacent one inside the bulb. Second, you will need to do a visual check of the switch itself, to make sure the internal contacts have not melted and are not shorting to each other. Only other quick test is to remove the four way flasher and plug it in where the one for the turn signals is. If the one for the signals is burned, it possibly could do that as well. (both flashers are the same) On an 89, there aren't any "modules" so it's a fairly simple system that should not be difficult to diagnose. Most turn out to be the switch under the steering wheel. Always make sure that all bulb sockets have a good ground. Good luck
When the signal is not working does the indicator in the dash stay lit ( green arrow) ?? if so check all the bulbs..another possibility may be a weak signal flasher . replace the flasher and or burned out bulbs. note.. some bulbs do burn out and work intermittently due to the fillaments contacting now and then due to bumps in the roadway. if these solutions dont work you may need a signal switch in the steering column....good luck
Click the turn signal switch to either the right or left and get out and check if the BULB comes on but doesn't blink. Try both directions. Does the arrow for that direction also come on, on the dashboard instruments and stays on but not blink? That is a built in indicator that a filament has burned out in one of the bulbs. Try replacing the bulbs. Could also be the fuse for that circuit. Check fuse panel for that circuit. Could also be the turn signal relay. Replace with newer style relay.
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