Originally Posted by JACK3D
I'm thinking it's probably the gauge. Because my speedo doesn't work. All the others work just fine. But two of them don't work properly. There was a previous leak behind the dash during heavy rain. which is now fixed. That could have something to do with it.
Yes. There could be corrosion on the contacts. Most likely it's the gauge. But, regarding the alternator, any chain parts store can test it for you. Wouldn't you want to know/rule out a charging system problem along with the battery checking out ok? There are a number of ways alternators can start to go bad; internal regulator, diodes, bearings etc., even a loose or bad belt. Also, check the wiring plugged into the alternator. I would rule it out and then take out and check the gauge connections.