Tach going crazy?
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Tach going crazy?
A few days ago my tach started bouncing all over the place while at idle and driving. I checked the wire, and it's still firmly on the coil.
Any thoughts on what's going on?
Any thoughts on what's going on?
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A bit unrelated to the tach, but my voltmeter does this every time it rains or there's humidity or the bird flies too close... I've double checked that everything is ok with an external voltmeter. Must be a ground somewhere. Slightly more related, are you still running off the trailing J-109? When my tach died, it went out completely. But maybe a loose wire in the ignitor could be bouncing around? Just another thing to try.
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My tach wire is wired to the -neg on the Leading coil (SA). I'm running the DLIDFIS mod with HEI modules. I too have an external volt meter but it's working fine at 14v constant. I'm going to put the wire on the Trailing coil to see what happens.
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for the hell of it, check your distributor rotor. that happened to me once out of the blue. tach needle bounced around while idling - would work fine while driving though - and it persisted like that for a while. i can't remember why, but for whatever reason, i had to pull the cap at some point and what i found was a broken rotor. the damnedest thing ... a true WTF moment.
needless to say, i still have it to this day.
needless to say, i still have it to this day.
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for the hell of it, check your distributor rotor. that happened to me once out of the blue. tach needle bounced around while idling - would work fine while driving though - and it persisted like that for a while. i can't remember why, but for whatever reason, i had to pull the cap at some point and what i found was a broken rotor. the damnedest thing ... a true WTF moment.
needless to say, i still have it to this day.
needless to say, i still have it to this day.
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