glow plug relay to dead batt. help

[hardtime]

hi and thanks to all replies,
i have a 99 f350. experienced hard starting rec. loc. in cent. OR. reg. temps in the 20s. poked around under hood found no power across gpr(checked with test lamp) jumped relay across big posts and truck fired right up not being pluged in and 18f outside. went to parts store and guy comes up with 2 different ones listed at 80$ and 40$ and both cross ref as starter relay and gpr. ask about diff. in amp capicity and answer was no?? took 40$ relay home installed and fired up truck Ran great fired quick but not wait to start light! installed new 850cca batts. (old ones were 5 yrs old) and changed oil. went inside for 2 hours and came out to a DEAD truck batts. went from 12.9 on multimeter to 1.23 WHAT IS HAPPENED??? thanks for any help!!!!

[adfields]

Hear is a

My wait to start light worked fine when it was in the 95, but nothing on that little square of diesel option lights works now in the 76 cab. I don't get it, all I did was unplug and replug everything. This is the only thing that don't work on my truck now. I was gonna wait till it gets wormer out and post a threat on it, but for now I will watch HARDTIME's post.