Does any one know how to fix this problem? I have my battery in the trunk but Im losing about 5.5 volts on the cranking. So its about 7.89 volts at my starter. So please if you have any ideas please contact me. or go to my web site
http://1973camarolover.tripod.com/

Another test would be to add a long test lead to your meter and measure the drop from the battery post to the solenoid terminal, not on the wires themselves, but the posts. This will measure the total drop including clamps, terminal lugs, and their crimped joints.

Low voltage is due to several things, too small gauge of wire used, should be no less than 00 AWG. Terminal lugs should be soldered onto cable using 63/37 rosin core solder. Remote switch, if used, should have the capability to handle min 250 amps. And, of course, all connections should be clean. Also, doesn't hurt to used silver plated copper terminal lugs.

Return path to battery should have the same characteristics, good body sheet metal, clean connections, and those leads connecting the engine to ground & battery to ground should be of the same AWG as the positive side.

The least amount of voltage drop I got was 2 volts. Be sure to adjust the alt output for the extra voltage drop, measure at the battery posts for charging voltage.

A few tips on reducing voltage loss. Thicker over all cabling kept clean. The cables of fine strands pass voltage much better than heavier strand which looks more like wires than hairs. Some audio shops sell the fine strand stuff in big gages. I think Lowes might even have it also. No matter what with goof wire there will still be some voltage loss due to distance the volts trvel but with the thicker fine wire cabling you'll have a better and surviable amperage being passed.