I have only recently Purchased a b7200 hst 4wd. The charging light started glowing after 2 days so I charged it. Then went the same again 2 days later So I bought a new battery 2 days later it started glowing again. I found a bad connection at battery terminal and cleaned it. Checked with multimeter and it was pushing 13.85v. today I hooked up the headlights through loom and original switch. I went to start it and glow plug indicator didn't get warm and she wouldn't start. Any idea what's wrong please