Greetings,
After my FACET fuel pump burned up the other day I am in the process of mapping out the current state of my DC power wiring. After reviewing all the great information at the MMI site and discussion groups I can see that my wiring is not exactly standard. Things thought are working and I plan on fixing things bit by bit as I understand things better with an eye initially on proper fusing and avoiding fires.
One easy upgrade I see would be the addition of the 20 Amp fuse in what is supposed to be a 12 AWG purple wire from the IGN post on the ignition switch and the positive post on the coil. My first question has to do with the placement of this fuse holder. Unfortunately, this wire is not purple and does not run back to the ignition switch on my boat. Instead it runs a few feet to a buss bar that feeds three or four other circuits (the one I have traced out so far is the fuel pump, which is fused but with at 5 amp instead of the old 10 amp). Is there any reason I cannot simply place the fuse at the end of the wire where it attaches to the positive post on the coil? From the info at this site I gather the fuse is designed to protect everything else from a short in the primary side of the engine so to my mind this location should be fine.
I have the electronic ignition upgrade on the system with wires running from the distributor to both the positive and negative side of the coil. Also I have a mystery wire running from the positive post of the coil to the back of the alternator (not sure which post yet). The odd thing about this wire is that it starts at the coil at what looks like 12 AWG but within a foot or two drops down via a butt connector to a yellow wire what looks to be 16 or even 18 AWG! I can’t believe that this is what is supposed to be the 8 AWG line back to the IGN post carrying charging current. I need to examine the back of the alternator and confirm what other if any connections there are.
Ken
After my FACET fuel pump burned up the other day I am in the process of mapping out the current state of my DC power wiring. After reviewing all the great information at the MMI site and discussion groups I can see that my wiring is not exactly standard. Things thought are working and I plan on fixing things bit by bit as I understand things better with an eye initially on proper fusing and avoiding fires.
One easy upgrade I see would be the addition of the 20 Amp fuse in what is supposed to be a 12 AWG purple wire from the IGN post on the ignition switch and the positive post on the coil. My first question has to do with the placement of this fuse holder. Unfortunately, this wire is not purple and does not run back to the ignition switch on my boat. Instead it runs a few feet to a buss bar that feeds three or four other circuits (the one I have traced out so far is the fuel pump, which is fused but with at 5 amp instead of the old 10 amp). Is there any reason I cannot simply place the fuse at the end of the wire where it attaches to the positive post on the coil? From the info at this site I gather the fuse is designed to protect everything else from a short in the primary side of the engine so to my mind this location should be fine.
I have the electronic ignition upgrade on the system with wires running from the distributor to both the positive and negative side of the coil. Also I have a mystery wire running from the positive post of the coil to the back of the alternator (not sure which post yet). The odd thing about this wire is that it starts at the coil at what looks like 12 AWG but within a foot or two drops down via a butt connector to a yellow wire what looks to be 16 or even 18 AWG! I can’t believe that this is what is supposed to be the 8 AWG line back to the IGN post carrying charging current. I need to examine the back of the alternator and confirm what other if any connections there are.
Ken
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