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 - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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