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Tach isn't working right. Sometimes it works without issue, othertimes it doesn't work at all, and yet sometimes it will just spring into action at random...
Even more then the battery, your tack gets it's signal from your alternator, so first check for loose or dirty wires, if they are fine, I wold say your alternator is starting to dye on you.
Mike
Don't go to E-Bay for an alternator.
First it isn't a $1000 part. Look around your town for a shop that rebuilds them, you can get it done for under $200.
Mike
You can do that, they are pretty expensive especially if you have a D2 with the 130Amp unit. I especially like the cost of the 2 options Rover Connection has.
Mike
So the stock alternator can be rebuilt? Is there a kit you can buy to do this? I've had alternators apart many times so I doubt I'd have an issue swapping new parts into it. Is there a place to purchase the correct internals online?