Quote:
Originally Posted by Noah930
OK, here's a technical question:
I've had an intermittent problem with a bouncing tach. The car runs fine, but the tach will bop around like it's not connected to anything. I had the engine pulled in January to fix some oil leaks. When the motor was reinstalled, the problem resolved...for a few weeks. It won't do it all the time, just intermittently. As the battery was 7 years old, I replaced it. Problem went away...for a couple weeks more. Then it returned. The charging system (measured at the battery with motor running/revving) seems to be working fine, but those measurements were taken while the tach was working fine. Headlights/instrument lights work fine and are at their baseline barely luminescent H5 glow. I even swapped in a loaner tach, which also worked fine ... for a bit. I was going to drop my old tach off at North Hollywood Speedometer for repair when, on the way to work today, I just caught out of the corner of my eye an erratic tach bounce. Couldn't reproduce it for the rest of the drive, though.
So am I just kidding myself and do I need to swap out the alternator & voltage regulator?
edit: I'm sorry. Am I interrupting your regularly scheduled programming on chicks, beer, and guns with a technical issue?
|
Rig up a DVOM where you can see it while driving, and set it to voltage (amperage is tricky) and when you see the tach bounce look at the meter and see what is actually going on.
If that doesn't work grab a chick some beer, and go shoot something