Many different ways to wire it with no indicator light. Back when the 10SI was "modern", GM used exciter relays for some hookups (instead of an indicator light). Some were hooked to engine oil-pressure switches.
The alternator (unlike a brushed generator), does not have enough residual magnetism to "excite" itself and charge at normal RPMs although some will after being spun around 2000 RPM. So, a small amount of current must be fed to it, to create magnetism, to get it started. The problem is, once the alternator DOES charge, current can backfeed through that exciter wire to the IGN circuit and prevent you from shutting off the engine. This is especially true with diesels that use low-current shut-off solenoids in the injection pumps.
So - you can use a light bulb as a resistor (and charge indicator), or a diode, or a relay, or just install a $15 "self-excite" regulator and hook with just one wire.
$2 spent at your local Radio Shack is the easiest. j$2 will get you a four-pack of 6 amp/50 volt diodes at Radio Shack. Part # 275-1661. The 3 amp units e.g. 271=1144 and 276-1143 also work fine. If you use the smaller 3 amp units, hook two in parallel to be safe. A 276-1661 diode is all you need.
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Today's Featured Article - Trailering Your Tractor - by Curtis Von Fange. One of the fun things of summer and fall are the parades and tractor shows that go on across America. Many owners of tractors travel long distances to attend these shows and they usually take their restored iron along with them. Safe trailering practices and inspections will ensure that the event is a fun one. A good habit to develop when using a trailer is to give that �quick look over� before taking it on a trip. Before hooking up to it check the tongue for proper operation. The latche
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