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Old 11-27-2010, 07:43 AM   #1
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Turn signal flashes rapidly (Different Type Socket Installed)

In my first "Hello" post I mentioned someone cut and removed a few light sockets from my '97 Jeep TJ.

I ended up replacing the missing stock front turn signal socket with a standard socket that uses an 1157 bulb (stock Jeep replacement sockets aren't sold separately and I wasn't about to buy a new wiring harness).

Using this bulb now causes the blinker on this side to flash rapidly (the other side is normal).

Looking through the forum, I found that there is a circuit in the flasher unit that must be detecting the 1157 as being a bulb that is not working. (I love the information base on this forum!) and goes into high speed flash mode.

O.K., my question...

If I follow the procedure for disabling this "high speed flash" circuit in the flasher as shown HERE, would it adversely affect all the turn signals, taking into consideration that I have mixed bulbs?

Or, should I just replace the remaining stock turn signal on the other side with another 1157 socket?

The circuit disabling is actually easier than having to modify an 1157 socket, which took some cutting of the socket housing and soldering.

I'm inclined to think it wouldn't affect anything but I don't want to create another problem for myself if I proceed with the circuit disable.

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Old 11-27-2010, 03:05 PM   #2
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my thought on this is it's designed that way for a reason-to let you know there's something wrong(usually a burnt bulb)
unless you are in the habit of checking your lights on a (semi) regular basis i'd replace with an 1157 socket rather than mess with the circuit.
I personally wouldn't have a problem with 'adjusting' the circuit, but being an RV'er i check my lights pretty regularly(on tow vehicle-every time i hook up and fairly often on other vehicles) although about 2 weeks ago it did the fast blinking on the jeep and a bulb was out. but then again i'm one of those that always uses directionals-even if i'm the only one at a 4 way stop(wife thinks i'm nuts) but i like others to know what i'm doing so maybe they won't do something stupid like pull in front of me.
check craigs list-know in my area theres always someone parting out jeeps-should be able to find a replacement cheap.

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Old 11-27-2010, 03:11 PM   #3
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We use directionals everywhere. My kids even use it going out of the driveway.
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Retired my 94 YJ 4cyl 5spd @ 200K
Now in a 04 TJ 4cyl 5spd CV @120K+
Both as a commuter vehicle in NW, NJ
April 2012.downsized and now a 99er.
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Old 11-27-2010, 05:18 PM   #4
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Quote:
Originally Posted by robbiecc View Post
my thought on this is it's designed that way for a reason-to let you know there's something wrong(usually a burnt bulb)
unless you are in the habit of checking your lights on a (semi) regular basis i'd replace with an 1157 socket rather than mess with the circuit.
I personally wouldn't have a problem with 'adjusting' the circuit, but being an RV'er i check my lights pretty regularly(on tow vehicle-every time i hook up and fairly often on other vehicles) although about 2 weeks ago it did the fast blinking on the jeep and a bulb was out. but then again i'm one of those that always uses directionals-even if i'm the only one at a 4 way stop(wife thinks i'm nuts) but i like others to know what i'm doing so maybe they won't do something stupid like pull in front of me.
check craigs list-know in my area theres always someone parting out jeeps-should be able to find a replacement cheap.
I will probably go that route (both using 1157's) just to avoid having two different bulbs in the set-up. If the rapid flash happens on both sides due to changing the remaining socket to an 1157, I think I can live with it. As it is now, it bugs me one sides flashes slow and the other is rapid. I don't like messing with printed circuits and if I ever come across a jeep being parted out I can always grab the stock sockets and change them back.
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Old 11-28-2010, 03:53 AM   #5
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Did you check to make sure your ground is good and tight, sometimes it can be a simple as that, sometimes that is
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Old 11-29-2010, 07:58 PM   #6
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Did you check to make sure your ground is good and tight, sometimes it can be a simple as that, sometimes that is
Ground could be a problem, but in this instance I'm sure it is because the 1157 bulb isn't providing enough load for the circuit to pick it up.
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Old 11-29-2010, 10:52 PM   #7
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check that another bulb is not out that would cause this
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Old 11-30-2010, 03:41 AM   #8
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Parts house - get a flasher designed for a motorhome or trailer b- usually called "towing."

Regular flashers are a thermal device. They depend on the total resistance of the bulbs to determine flash rate. the towing type does not. You can run lots more bulbs with them. I think they are about $10.
Look at yours first, there are 2 types, 2 and 3 pins - get the same type.
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Old 12-02-2010, 07:04 PM   #9
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Originally Posted by rrich View Post
Parts house - get a flasher designed for a motorhome or trailer b- usually called "towing."

Regular flashers are a thermal device. They depend on the total resistance of the bulbs to determine flash rate. the towing type does not. You can run lots more bulbs with them. I think they are about $10.
Look at yours first, there are 2 types, 2 and 3 pins - get the same type.
Thanks, I'll look into them. Are they made to fit a standard Chrysler 1157 bulb socket? - which is what I replaced the stolen Jeep turn signal socket that calls for a different type of bulb (refer to my 1st post).

EDIT: After re-reading what you wrote, I just had an "Aha!" moment. You were talking about the flasher module, weren't you?

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