Use your multimeter to measure the number of amps between the battery cable and the battery. Then start removing fuses until the current drain stops. You can also disconnect the alternator and the regulator to see if that stops the drain. Once you broadly localize the drain, you can start refining your search to a smaller and smaller segment of the wiring harness. A '70 does have some fuses - they are inline with the wiring harness.
It helps to refer to the wiring diagram - http://oljeep.com/gw/elec/GW_wiring.html
- the wiring in a '70 is simple by modern standards, but unfortunately there is no color code. I suggest you enlarge the diagram with a photocopier and start tracing out your circuits with color pencils. Be patient and systematic, and you will find the problem.
The '72 harness is similar to the '70. Look at it too, since it is shown in picture form. It may help you to locate things.
1) '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps. 2) '82 J20 360/T18/NP208/3.73, KOs, 7600 GVWR 3) '75 CJ-6, 304/T15, PS, BFG KM2s, soft top 4) '95 VW Golf Sport 2000cc 2D