Bdenney Posted April 9, 2015 Share Posted April 9, 2015 We are a small company only running 2 trucks and we've spent tons of money on our 2011 mack. We've only had it for 6 months and it's been back to the dealership 5 times because of problems with the dpf system. We finally got all that straightened out and now a problem with the lights. Everything works fine when the lights are off. When the light switch is turned on the left turn signal indicator on the dash stays on and all the left turn signals stays on. No flashing just bright. We changed the signal switch and no luck. Soon as you turn lights off the indicator goes off and everything works perfectly. Please help. We can't afford to keep taking it back to mack to have it fixed Quote Link to comment Share on other sites More sharing options...
Timmyb Posted April 9, 2015 Share Posted April 9, 2015 Are your indicators bulb type or led? Quote Link to comment Share on other sites More sharing options...
85snowdog Posted April 9, 2015 Share Posted April 9, 2015 Unplug or take out the left turn lights one at a time. If the problem goes away its in the bulb or led unit. I have seen this before. Might not be this, but easiest spot to start. Next is a short in the wiring. Can be a little more difficult to find. Good luckO , and Welcome to BMT Quote Keith Link to comment Share on other sites More sharing options...
41chevy Posted April 9, 2015 Share Posted April 9, 2015 Unplug or take out the left turn lights one at a time. If the problem goes away its in the bulb or led unit. I have seen this before. Might not be this, but easiest spot to start. Next is a short in the wiring. Can be a little more difficult to find. Good luckO , and Welcome to BMTAfter you check the bulbs or LEDs check the grounds for those lights too. Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment Share on other sites More sharing options...
j_martell Posted April 9, 2015 Share Posted April 9, 2015 My granite had similar problems last year. It was the wiring loom that goes from the front of the frame into the hood. It had chaffed through and was shorting the left light cluster..... Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment Share on other sites More sharing options...
Bdenney Posted April 9, 2015 Author Share Posted April 9, 2015 I appreciate the advice guys. I found the problem. Believe it or not, the problem was the bundle of wires that go from the firewall under the cab to the back of the cab into the female plug for the trailer pigtail. Someone had spliced it and it was dirty and wires touching. 1 Quote Link to comment Share on other sites More sharing options...
Freightrain Posted April 9, 2015 Share Posted April 9, 2015 Glad you found it. That was going to be my first thought............does it happen with or without a trailer. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
Bdenney Posted April 9, 2015 Author Share Posted April 9, 2015 It shocked me because It done it with or without the trailer hooked up. These new trucks are nuts lol Quote Link to comment Share on other sites More sharing options...
Lifey Posted September 4, 2017 Share Posted September 4, 2017 Bdenny, I'm actually buying a 2011 Pinnacle in a couple of weeks. Everything I have researched so far is positive but haven't had a chance to get feedback from drivers who actually own one. How has the truck worked for you since you've had? Have you had to change the Injectors and Cups yet? Is there any advice, tips you can give me to help me stay ahead of any potential problems? Thanks for your help. Quote Link to comment Share on other sites More sharing options...
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