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2002 Dodge Ram 3500 flasher relay keps going bad


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TC46305525
New User

Nov 12, 2018, 3:51 PM

Post #1 of 6 (192 views)
  post locked   2002 Dodge Ram 3500 flasher relay keps going bad  

Just ran into a problem a couple of months ago. My flasher stopped working on my 2002 Ram 3500. I do not use this truck much, about 2000 miles a year, 5.9 diesel. I replaced the flasher relay and everything worked fine in the drive way. About 7 weeks later I used the truck to go 22 miles to pick up some tools from Harbor Supply just to run the truck a little. The turn signals worked just fine on the way there. On the way back the turn signals stopped working. No fuse gets blown, swapped out the turn signal switch from my other dodge 3500, blinkers still did not work. Put in a new flasher relay, everything worked. Took the truck down the road about 8 miles, everything worked. On the return trip the flasher relay stopped working again. All total 4 new relays, 2 new from the Dodge dealer and 2 new from Advance Auto. When I checked the last blown relay after I bought a test light. providing power to terminal 85 and 86 I can hear and feal a click. But providing + power to terminal 30 while the coil is energized the test light and volt meter is showing no power going to terminal 87 or 87A. without the coil energized and power going to terminal 30, I still do not get power to ether terminal 87 or 87A. What could be burning out this side of the relay. The coil side does not burn out, only the side that goes from 30 to 87 and 87A side. Thanks TC


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 12, 2018, 4:15 PM

Post #2 of 6 (188 views)
  post locked   Re: 2002 Dodge Ram 3500 flasher relay keps going bad  

Yeah, I bet if you simply removed the old relay and put it back in, that would work also. I don't believe anything is going bad in the relays. It's the wiring contacts in the socket that have been overheated and have extreme resistance now.

I would look into that and determine if there is any discoloration or melted plastic there.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



TC46305525
New User

Nov 12, 2018, 8:27 PM

Post #3 of 6 (165 views)
  post locked   Re: 2002 Dodge Ram 3500 flasher relay keps going bad  

Thanks Hammer Time for the help, it could well be a bad connection. Only thing I did not keep the first bad relay. The 2nd relay when I took it out I could hear a rattle inside the relay. When the third relay stopped working I took the second relay which was a Mopar oem relay apart and found a peace of metal had come unsoldered on both sides of the relay looked like some type of heat sink. I then took the third relay apart (oem relay) and the same metal part had came unsoldered on one side. I then got a test light on the 4th one and could hear the relay coil engage but could not get a flow of electricity from terminal 30 on the relay to terminal 87 or 87A. meaning to me that somehow the switch inside the relay was burn out and could not transfer electricity from 30 to 87 or 87A which would then send power back to the blinker switch where it would then be sent to the blubs. To my understanding with power to terminal 86 and 85 the coil should engage and with power to terminal 30, test light grounded to Negative on the 12 volt battery, touching teat light probe to ether 87 or 87a I should get a blinking light on the test light on one of them. Without power going to the coil terminals 85 and 86 with + power going to terminal 30, test light grounded to battery if I touch terminal 87 or 87a the test light should light up and stay on. I can not get any electricity to flow from terminal 30 to 87 or 87a with the coil engaged or not engaged with the bad relays I will take time to buy another new one to make sure what I understand on checking a relay is right. If it is then something is burning up the part of the relays that switch power back and forth from terminal 30 to 87 or 87a after use of just a few turns but not blowing the fuse.. Thanks TC


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 12, 2018, 8:30 PM

Post #4 of 6 (161 views)
  post locked   Re: 2002 Dodge Ram 3500 flasher relay keps going bad  

Relays do not just "burn up".

You might be damaging them when you removed them but they don't just fail on their own.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



TC46305525
New User

Nov 16, 2018, 2:05 AM

Post #5 of 6 (121 views)
  post locked   Re: 2002 Dodge Ram 3500 flasher relay keps going bad  

Just wanted to thank everyone that looked at this. Looks like we will never know what was causing this problem. Had someone that wanted my Ram 3500 and offered me $500.00 less than what I would have wanted if I had found out what was causing this problem. He was sure he could trace the problem down, so he took it. Thanks for all input.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Nov 16, 2018, 4:59 AM

Post #6 of 6 (115 views)
  post locked   Re: 2002 Dodge Ram 3500 flasher relay keps going bad  

OK, will close this now.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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