Killed two Autometer tachs...no idea how
#1
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Killed two Autometer tachs...no idea how
So i got the FB running, and for the sake of seeing my RPMs i decided to run an Autometer tach. Simple wiring seeing i wired the MS up without issues. One switched 12v, 1 ground and 1 tach signal wire. Nothing special. Ran the tach signal from the Neg on the trailing coil. Have it set to 4 cyclinder.
The first tach worked fine for a few minutes. Put the ign forward, it saw power, set itself down to "0" then when i cranked it registered. Fired it up read properly. Then it became out of whack, then it stopped moving and then it did nothing. Thought it was in the wiring. Check everying, and its normal. Returned the tach to Summit (live close by). Got another.
Installed it. DID THE EXACT same thing. SO. I am stumped. Really have NO idea what could be causing this. I am going to run wires from all new sources for the next tach and hope summit will take this one back too.
The first tach worked fine for a few minutes. Put the ign forward, it saw power, set itself down to "0" then when i cranked it registered. Fired it up read properly. Then it became out of whack, then it stopped moving and then it did nothing. Thought it was in the wiring. Check everying, and its normal. Returned the tach to Summit (live close by). Got another.
Installed it. DID THE EXACT same thing. SO. I am stumped. Really have NO idea what could be causing this. I am going to run wires from all new sources for the next tach and hope summit will take this one back too.
#7
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If you mean that the tach would load down your spark intensity, it shouldn't. It should place only a tiny load on the ignition circuit. Not enough to matter. After all, the tach is made for normal engines that only have one igition system.
With regard to the powering up: that's a good question. Only things I can think of that would kill new electronics that quickly would be severe overvoltage, reversed polarity, or something like that.
With regard to the powering up: that's a good question. Only things I can think of that would kill new electronics that quickly would be severe overvoltage, reversed polarity, or something like that.
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#11
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Megasquirt. I have an MSD box but right now the Megasquirt is using its output. But i might split off its signal for the next round of tach
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Jeff20B
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09-16-18 07:16 PM