Some dash lights flash on and speedo drops while driving - JeepForum.com
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post #1 of 3 Old 09-16-2020, 06:38 AM Thread Starter
Tlando
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Some dash lights flash on and speedo drops while driving

This morning while driving to work, i noticed the ABS and BRAKE lights flashed on for about a second and when they did the speedometer would fall to zero until the dash lights turned off and then the speedo would go back to normal. All would happen in a bout 2 seconds time and my RPMs an driving speed never changed.

Anyone know what could cause this?? loose wire or faulty sensor maybe?
just changed spark plugs and ignition coils saturday.

Thanks in advance

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post #2 of 3 Old 09-16-2020, 12:03 PM
GmanWJ
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Up front ... no, I do not really know why this would happen. BUT I have read many stories about similar dash light/gauge problems and many of them talk about voltage problems. So my recommendation to you would be to check your battery, battery terminals, and battery cables. Check voltage, check for corrosion, ensure tight connections.



Then check your grounds, make sure they are CLEAN and tight. If the grounds are rusty, grimy or oil-soaked, maybe give them a thorough cleaning. There is a very good write-up about suspect grounds here: https://www.jeepforum.com/forum/f310...-info-4192594/
Should probably check all the G100's. G200 sounds like a potential culprit as well.
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ok mostly just repairs, but we are closing in on a lift
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post #3 of 3 Old 09-17-2020, 08:39 AM Thread Starter
Tlando
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i had made sure the grounds were secure and with the on/off rain i got yesterday i just grew more and more frustrated. once i calmed down i went back to the battery and made sure the negative cable had all wires connected and terminal was clean which is usually what it is. that was no dice so i pulled the positive terminal and there lay the problem. it was coated so badly in green and white corrosion you couldnt see the terminal itself. once clean jeep fired right up and all clusters, gauges, and radio began to work again.
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