1999 Dodge ram speedo problems
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Joined: Nov 2024
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I've had the erratic shifting (usually between 40 & 50 mph) issue for a couple of years. When I described the problem to a mechanic friend of mine, he instantly knew the problem: a bad diode in the alternator. We replaced the alternator and the problem went away -- for about 1 year.
Alternator tested good. After doing some research online, I read that having a bad ground to the alternator could cause it, so I cleaned up the ground connection to the body and that seemed to fix it -- for about 1 year. I replaced the ground wire with a heavier gauge wire and that fixed it -- for about 6 months. More research indicated that connecting an accelerator pedal position sensor noise isolator ( $9.99 - see instructions for installing it) would take care of the problem. That seems to have fixed it and is still working 1.5 years later.
Alternator tested good. After doing some research online, I read that having a bad ground to the alternator could cause it, so I cleaned up the ground connection to the body and that seemed to fix it -- for about 1 year. I replaced the ground wire with a heavier gauge wire and that fixed it -- for about 6 months. More research indicated that connecting an accelerator pedal position sensor noise isolator ( $9.99 - see instructions for installing it) would take care of the problem. That seems to have fixed it and is still working 1.5 years later.
