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Message: <blockquote data-quote="Rednaxs60" data-source="post: 192042" data-attributes="member: 4617">This happens when an alt mod is done.  The volt meter on my '85 LTD reads about 5 VDC less than actual at the battery.  Lots of loss through the wiring.Put new Fiamms Freeway Blaster horns on the '85 and had to install a separate relay for the horns and a separate supply from the accessory fuse block.  Too much load for the original wiring and fuse.  Would recommend a relay for yours as well.With your new to you fuse block, you could easily add a circuit for the horn and trailer lighting.  Might be able to separate the radio and voltmeter and run separate wires as well.  Going to try to do this with mine.For a relay trigger there is not a huge voltage requirement.  I would run a wire from the engine stop switch that could come from the coils (black/white striped wire).I also have a separate wire directly from my accessory fuse block that I installed a while ago that connects to the coils.  This takes all parasitic loads off the 12 VDC wire going to the coils.  The accessory fuse block is switched on/of by a relay that uses the engine stop switch as a trigger.  Just a thought.Cheers</blockquote>