hi guys., 1980 fj40., 40 amps alternator......just put in agm red top battery(2 months ago) pamphlet with battery says needs for charging 13.8 to 14.4. my voltage regulator worked well with a regular flooded battery.....but a bought an agm for safety (i thought) . when daytime driving my battery stays well charged up but when i drive at night with lights on and fan ., i check my battery an i find it at 12.34 so well below the 12.87 full charged.....my question is can i adjust my VR to raise the amount of charging w/o damaging my wiring an charging my agm as needed? your input would be very welcome as usual thanks...ps my 2018 f150 with agm battery goes up to 14.5 at least when my headlights and accesoiries are on.....i know we can't compared both but....just saying...