wp29p4a
Forum Regular
MY 1974 se
Posts: 376 
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Post by wp29p4a on Sept 21, 2022 17:35:17 GMT -5
I bought a replacement tach to replace the clock. When I installed it, it worked fine, now it bounces instead of reading steady. I have replaced the Chrysler electronic ignition box with a MSD unit that has a tach connection and it still bounces. What am I missing?
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Post by odzking on Sept 22, 2022 8:47:32 GMT -5
Did it work properly with the Mopar ECU? If so, the MSD is your problem. Not the first person to experience this, I know.
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wp29p4a
Forum Regular
MY 1974 se
Posts: 376
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Post by wp29p4a on Sept 22, 2022 12:44:04 GMT -5
If it worked with the Mopar unit and not the MSD, there would be no logical reason for me to ask the question.
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Post by Nacho-RT74 on Sept 23, 2022 16:06:24 GMT -5
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DynoDave
CO-ADMINISTRATOR
Motown Mopar-Wizard
Posts: 11,160
Member is Online
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Post by DynoDave on Sept 24, 2022 20:48:17 GMT -5
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wp29p4a
Forum Regular
MY 1974 se
Posts: 376
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Post by wp29p4a on Sept 25, 2022 9:51:52 GMT -5
That was helpful, and I enjoyed the Holley forum post also. I had some issues with a bad voltage regulator overheating my battery, so the Holley post gives me some ideas to look at that I haven't already considered. It's an aftermarket fake Mopar tachometer, it worked fine when I installed it but at some point the bouncing started and none of the changes have made any difference. Does it with the Mopar ign controller with the tach connected to the coil, also does it with the MSD with the tach connected to the tach output on the MSD controller. Didn't change when I tested 3 different voltage regulators.
If I had to take a wild guess, I believe the fake Mopar tach is low quality or I damaged it somehow working on the electrical system, and now it has an internal issue that causes it to identify as the bouncing girl in the video. I'm going to try disconnecting the alternator, and test it, then add a resistor to the tach signal line and see if that helps. Then come back and watch the bouncing video if I need more motivation.
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Post by Nacho-RT74 on Sept 25, 2022 17:41:53 GMT -5
It's not that kind of bouncing Nacho.  WOOOOPS, sorry... maybe language issues |
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Post by Nacho-RT74 on Sept 25, 2022 17:42:57 GMT -5
Then come back and watch the bouncing video if I need more motivation. glad it helps! |
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