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Left turn signal blinks brake lights

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  #1  
Old 10-24-2009, 06:38 PM
canyonland23 canyonland23 is offline
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Post Left turn signal blinks brake lights

Right turn signal operates as normal. Left turn signal blinks the front left bulb, both left rear bulbs, the 3rd brake light and the top right rear bulb, but not the front right. I've tried to chnage out bulbs and swap them around to no avail. I've also tried to replace the flasher relay under the dash to no avail as well. What could the problem be? Thanks.
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  #2  
Old 10-25-2009, 05:25 PM
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Need more information, year and body. NS 1996 -2000,RS 2001-2007 or RT 2008-. And does the 4 way flasher work as normal too.
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Old 10-25-2009, 06:06 PM
canyonland23 canyonland23 is offline
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Whoops. Sorry about that. 2000 Grand Caravan LE, 3.8L, AWD. The 4-way hazard flasher flashes everything. Both top and bottm lights in the tail on both sides, the 3rd brake light and both front lights. I'm not sure what you mean by "NS 1996 -2000,RS 2001-2007 or RT 2008". Hope this helps.
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Old 10-25-2009, 07:55 PM
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Sounds like a two filament light bulb in a shared socket and the signal light current is leaking to the brake light circuit through a short in the socket.
What happens when you remove the signal light bulb. Do the brake lights still activate?
Is the signal light a two filament bulb, one filament for signal light, the other for park or brake?
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Old 10-25-2009, 08:51 PM
canyonland23 canyonland23 is offline
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The tail lights are a 3 bulb setup. The top one for brakes and night running lights. The middle for signals and night running lights. And the bottom one for reverse. The the top and the middle bulbs are the same dual filament type (3057). If one or both of the bulbs are removed from the tail light assy, then the left rurn signal still blinks the 3rd brake light, the top right rear bulb, and the front left. So, is it a tail light assy? It does have electronics because the bulbs plugs are pressure twisted to make contact when twisted/locked in place to make electrical contact. Is it maybe the PCM under the hood next to the relay housing?

Yes, the brake lights still work.
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Old 10-25-2009, 09:40 PM
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Here is an easy way to find the problem. Remove the tail lamp assy out from the good side and plug it in the other side. If the blinkings work normal, then the tail lamp assy is the problem. NS is the body style of your van. If you had a 2001 then it would be an RS body.
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Old 10-26-2009, 04:16 PM
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Quote:
Originally Posted by canyonland23 View Post
The tail lights are a 3 bulb setup. The top one for brakes and night running lights. The middle for signals and night running lights. And the bottom one for reverse. The the top and the middle bulbs are the same dual filament type (3057). If one or both of the bulbs are removed from the tail light assy, then the left rurn signal still blinks the 3rd brake light, the top right rear bulb, and the front left. So, is it a tail light assy? It does have electronics because the bulbs plugs are pressure twisted to make contact when twisted/locked in place to make electrical contact. Is it maybe the PCM under the hood next to the relay housing?

Yes, the brake lights still work.
There's current from your signal lights leaking to your brake lights somehow.

When you put the left (drivers's side) signal light on, does your license plate light come on as well as your center brake light and your left brake light? Do you have a trailer towing connector that could be shorting?

Some observations when looking at the wiring diagram for the 2000, which can be found at http://www.oplin.org/search/google/a...itesearch=#195
- power supply to the upper tail light and the lower tail light is the same, a brown/yellow wire. It could be that the signal light socket is shorting some power across to the tail light, which in turn is causing the other tail light to come on. One would have to take careful note of which filament is suppose to light (do what/when) and compare that to what's actually happening.

- power for your center mounted brake light and rear brake lights is from the same source (white/tan wire). Is your right side brake light working?
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Old 10-27-2009, 08:47 PM
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Well, swapping out the left tail light for the right one did not change the results. I still get wierd blinking in the both left rear lights, the center brake light, the top right rear light and the front left light when using the left turn signal. I inspected the trailer towing harness as far as I could see and it all looks good. No nicks or bare wires or anything. It does travel up behind the bumper and up above the spare tire. If the spare tire was loose, could that maybe have chaffed the wire harness? I'm not sure where the wires exactly go to meet up with the regiular chasis wiring for the rear of the van. I appreciate everyone's responses for helping me. Anyone have anything else for me? Thanks.
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Old 10-27-2009, 09:27 PM
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That tells me the tail lamp assy is good. Have try to replace the combo flasher? That would also cause a feed back problem too.
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Old 10-28-2009, 11:25 AM
canyonland23 canyonland23 is offline
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If that combo flasher you speak of id the one under the dasher, 4th row up from the bottom in position #4, yes, I tried to change that out. I was lucky enough to have the dealer return it for me since electrical parts are non-returnable. I believe it's also called the Non-DRL Flasher Relay. That change out did not work. I'm just going to have to have my mechanic troubleshoot it at whatever per hour diagnosing charge there is. BUt before that, I may just take apart my sterring column to take a look at the turn signal switch to see if there is a greae build up. This post says that fixed their problem. http://forum.chryslerminivan.net/showthread.php?t=9163
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Old 10-28-2009, 02:08 PM
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Quote:
Originally Posted by canyonland23 View Post
If that combo flasher you speak of id the one under the dasher, 4th row up from the bottom in position #4, yes, I tried to change that out. I was lucky enough to have the dealer return it for me since electrical parts are non-returnable. I believe it's also called the Non-DRL Flasher Relay. That change out did not work. I'm just going to have to have my mechanic troubleshoot it at whatever per hour diagnosing charge there is. BUt before that, I may just take apart my sterring column to take a look at the turn signal switch to see if there is a greae build up. This post says that fixed their problem. http://forum.chryslerminivan.net/showthread.php?t=9163
Might want to take your spare tie down and check for wire problems there plus
- you can practice the process in case you have a flat tire tomorrow;
- you can check the tire air pressure, it could be surpriseingly low;
- you can rustproof the area and the back side of the rim;
- you can rustproof/lubricate the cable mechanism.

Do you have dielectric grease handy? A little dap on spark plug terminals, inside spark plug boots, light bulb connections, etc works wonders at keeping things greased and connections protected from moisture.
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Last edited by TJeepman; 10-28-2009 at 02:16 PM..
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Old 11-06-2009, 05:14 PM
canyonland23 canyonland23 is offline
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Took spare tire down. All the towing wires are good to go as far as I can see before it goes up into the chasis. I have some wiring schematics that I'll go over and try and find where the short is or bare wire.
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Old 11-06-2009, 05:53 PM
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I had a similar problem happen with a Chevy Venture. Different vehicle than yours, but electricity works the same. I'll share the information from that mess.

In that case, the board that held the bulbs on one side was bad. It caused the negative connection on the plug to melt. No negative connection, so the power would try to flow wherever it could, causing the back end to light up like a christmas tree whenever I used the left turn signal, or the brakes whenever the headlights were on.

Replaced the plug, it worked fine a couple of months until the new plug melted. Replaced the circuit board and the plug, worked fine for years.
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Old 11-10-2009, 04:43 PM
canyonland23 canyonland23 is offline
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I swapped the tail lights last night and the prpblem still exists as stated in my original post. The problem stayed the way it was. So, that tells me that my tail light(s) electronics are fine and not melted or anything. The plugs are good and making contact. So the problem with the current is before it gets to the tail lights? I have no idea what to try next. I'm just gonna have to take it to a mechanic let them figure it out at whatever cost.
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Old 11-11-2009, 09:02 AM
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There's leakage somewhere for sure. Some suggestions.
- when you apply the brakes, do any other rear lights come on back there, that shouldn't?
- check your relays, take them out and clean them up.
- any wires coroded around the battery area?
- I would be tempted to cut a wire or two from the trailer lights connection, test and then connect them back up.
- any body work been done on your vehicle recently that may have damaged some wires?
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Old 11-13-2009, 09:15 PM
canyonland23 canyonland23 is offline
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Problem soved!!! I finally had to take it to my mechaninc and it turns out that the turn signal/brake light splitter for the towing harness went bad. I would have never of found that little device. Anyway, all is good now with left hand turns. Thank you to all who responded and helped me try and reslove my problem. Thanks again and good night.
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Old 11-14-2009, 01:09 PM
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Quote:
Originally Posted by canyonland23 View Post
Problem soved!!! I finally had to take it to my mechaninc and it turns out that the turn signal/brake light splitter for the towing harness went bad. I would have never of found that little device. Anyway, all is good now with left hand turns. Thank you to all who responded and helped me try and reslove my problem. Thanks again and good night.
Was that just a plug in connector in the jack compartment?
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Old 11-14-2009, 03:22 PM
canyonland23 canyonland23 is offline
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Yeah, I guess so. It as behind the jack compartment panel. It was some kind of diode splitter for the tow harnesss.
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Old 11-14-2009, 05:28 PM
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Thanks. I'll keep that in mind.
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Old 07-04-2011, 07:39 PM
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I know this is years late, but thanks for the thread.

I've owned a 2000 Dodge Caravan for 10 years. It was a leased vehicle and we bought it from the dealer with 12,000 miles on it.

I had the same problem (well sort of). When I stepped on the brake the left front turn signal light came on.

My van had no towing package. There are no cables underneath, but this was the only thread that came close to my problem. So I took out the jack and found some after market cables plugged into the left rear light plug and an extension plug sticking out the van body to the left rear light assembly. Obviously the previous owner had added a towing package and removed it before returning the lease.

If I had known better, I would have realized that the white (non color coded wires to the plug at the light were after market as they didn't have the Dodge color scheme.

I removed the extension and re-attached the proper plug to my rear light assembly and the problem went away.

Thanks for the thread. Without it, I would have ripped the car apart trying to find the short.
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Old 07-04-2011, 07:39 PM
 
 
 
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