Toyota Repair: 1989 toyota 4X4 pick up, volt ohm meter, fuse box

Question
I am very pleased to be able to ask you for your opinion. Thank You! I have 360,000 miles on this truck. I did a total rebuild at 180,000 and at 320,000 replaced the the head (valves,cam,lifters etc). These are highway miles. I am now at 360,000 miles.I am blowing the emi fuse. At first it only happened occasionaly and I would replace the fuse and hope for the best. I could go months without the fuse blowing.I am now blowing the emi fuse every time I hit a bump and am accelerating. Another new development is my wiper fuse (located in the cab) is now blowing. I wonder if this is related. I suspect that the short may be in the fuse box next to the batery because  at one point the short stayed open and I could not replace the efi fuse without it blowing until I replaced the efi relay and then the open short stopped. I am guessing maybe my jiggling the box to get the relay out did more good then repacing the relay (the relay was only 6000 miles old).
I spent the last serveral days replacing my old injector connections with new ones(including new factory wires I spliced into the harness) and took off the plenun and checked that part of the harness. It is still shorting. Any ideas where to look?

Answer
Some thing like this is very hard to diagnose without having access to the truck and even more difficult because it seems to be intermittent. Obviously there is a short to ground somewhere in the efi circuit, the only thing I have seen in the past that may cause this is the wiring under the truck for the O2 sensor, the wires may be damaged due to road debris or the front driveshaft may be rubbing on the wires so check for that, other than that a volt/ohm meter may be needed to check wiring from the efi fuse to where it may be grounding out.