Flickering Lights and Unintended Downshift in '95 6.5L Diesel Suburban

I hope you can help me out with my ’95 6.5 L diesel Suburban. When least expected, all lights on the vehicle will go dim then bright, flickering up and down. Then the transmission shifts down to 3rd ? gear. If I shut it off and restart, the transmission works fine again, until the flickering happens. I have had it checked out by the dealer who tells me he can find nothing wrong. Any ideas?

Pam, Modesto, CA


Pam, I suggest that you have the 6.5 L diesel batteries

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Bill Heath owns Heath Diesel Power in Ellensburg, Washington. He races at Bonneville in his 6.5L Land Speed Racer whenever he gets the chance.


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