Re: splice near horn relay??
Diode may be an anti-feedback diode preventing engine to continue running once the ign is turned off, as if ign sw is still turned to IGN position.
If diode is not in the circuit, the alt is still turned 'on' and feeding electrical power to the rest of the elec system. Follow the brown wire in the schematic and you should find the brown wire goes back to the ign switch, thus to the rest of the elec system.
You are making a schematic of the wiring as you go along so later in life, you can refer to the drawing for troubleshooting purposes?
A picture of the back side of the alt, including the two-wire connector?
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