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The Jeep Grand Cherokee was redesigned for the 1999 model year; the 2000 models have minimal changes. This model is also known as Jeep WJ.

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left blinker only works when you turn the heat on

I installed a new multi switch on the steering wheel and still have the same problem the left blinker only works when you turn the heat on and the cab gets warm very confused

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@ernestyuse I wonder if this could be related to a bad really (combination Flasher) or the BCM (Body Control Module). Also check for corrosion. Check the wiring harness and the cables ends carefully. Corrosion increase resistance and poor contacts that may increase conductions as they heat up would be a possibility. I''d start with the flasher relay. Here is the 2004 Jeep Grand Cherokee WJ Wiring Chapter for your model Jeep. Page 231 starts the Turn Signals sections.

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Ernest Yuse will be eternally grateful.
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