I suspect a short somewhere that caused much of a drain, but what was said about low initial charge and mild use would contribute to your experience.
If it will take a jump, run it over to the parts store and get the charging system and battery checked like
@
jgue467
said
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1999 Toyota 4Runner SR5 Sport 4WD, V6 5-Speed e-Locker->
4WD 4runner Journal Thread
1999 Toyota 4Runner SR5 Un-Sported 2WD, V6 Auto ->
2WD 4runner Journal Thread
1959 Chevy 3100 1/2 Ton Pickup EVERYTHING done 'cept paint and body
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