Look at the following illustration and math: All I need to do is make a parallel circuit and make sure that the parallel circuit has more resistance than the main circuit. Here is a very very very basic explanation of how a shunt works.Ĭonsider I have an ammeter that only reads between 0 and 1 amp because it is very small, yet I need it to read say a 20 amp circuit. All I am really using the terminal block for is an extension of the alternator's positive terminal. Any accessories I connect will be individually fused. It is not fused currently nor do I really intend for it to be. Since it's only a 60 amp alternator I figured that should be plenty for anything I would ever want to connect. I used #8 wire which is supposed to be good for 50-55 amps. I even thought about using the alternator's factory choke output to use another relay to provide engine-running hot.įor what it's worth I did use a clip lead and an automotive bulb to test my wiring and anything connected to the terminal block positive does show a discharge across the meter. The terminals in the middle are un-used but I will eventually wire a relay to provide some terminals for key on hot. The left three terminals are jumped together and connect to a very solid chassis ground. ![]() They are hard to see, but the right three terminals are jumped together and give 12v+ all the time. I wired this up the other day to make ready for my future electrical upgrades. Thus I suggest using a terminal block such as this. Now the alternator has a very short post so it's hard to connect a lot to it. If you connect to the alternator, all of the current goes across the gauge. Thus if you connect anything to the starter relay or the battery, only the charging current goes across the gauge, not the discharge. ![]() It ties in somewhere into the main power lead from the alternator and connects at the side of the starter relay. ![]() The ammeter is a shunt that parallels the charging circuit. I found a website that gives a fairly over simplified drawing of the wiring. Connect your accessories to the alternator positive.
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