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Roger...I replaced the lead on my clock by using a 16 gauge wire with an in line fuse directly to the b+ line. Eliminated the undervoltage problem that way. Can't tell you how many (it seems like miles) of undersize wire I have replaced from power windows to rear wiper and lights.
What I did was to fabricate a nylon block that is adjacent to the battery. A short lead goes from the battery to this block which has a thick piece of solid copper (1/2 " wide x 1/4" thick x 2"long)with copper screws every 3/8 or so threaded into the copper. The nylon acts as an insulator and is mounted adjacent to the vacuum cannister next to the battery but on the vertical engine side of the shelf. It gave me places remote from the battery terminal to attach the aux lines that are attached to the battery post in the original design (very poor). This got rid of nearly every non ground related glitch in the system. Then I added a heavy braided ground between the stud on the firewall on the exhaust side and ran that to the engine. Forgot what bolt I attached it to...
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Bob S. former owner of a 1984 silver 944
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