starter troubleshooting

I use two Trojan Group 27s for both house and starting. Lately one battery turns the M25 over with less oomph than the other. Both batteries were installed by the PO in early 2012. When on the Xantrex Truecharge2 40A charger, Hydrometer readings on Battery 1 are 127 for all six cells. Three...

We have a Universal M25XP, with glow plug button. It's common when pushing the starter button (after holding the glow plug button in for about the right amount of time, and continuing to hold it) to get no response-- engine doesn't turn, no noise. Then, a few seconds, or minutes later, doing the...