Perhaps I'm testing it wrong? I hold the red tester lead to the battery side of the link, and the black tester lead to the other side of the fuseable link.
Okay, now I understand how you got those readings. You can certainly do what you did but it isn't the easiest way to do the testing we wanted to do. You should be making the readings with the meter reference to ground. That is by placing the black common lead of the meter to a good chassis ground point. Then place the red probe of the meter on each of the fusible links on the protected side of the link. You should see 12 volts at each of the links if the links are good along with the power source.
Making the readings the way you did seems to indicate there is a problem with all of the links, especially the one that had 12 volts on it. Making the measurements the way you did there should normally be close to no voltage since the links should have very low resistance and that means a low voltage drop. A good fuse will always have very little voltage across the fuse itself since it basically is a piece of wire. A fusible link has a specific current capacity and will melt in the middle if the current exceeds the limit.
Edited by Cougar, 27 November 2012 - 06:06 PM.