adding a charging fault light

Hi Y'all,

Since i dont have my instrument cluster completely back together, i decided to add some hidden non stock niceties. One of these is an alternator fault light.

I am using a mini denso alternator which has a spot on its built in regulator for an indicator light. It a pretty simple circuit. The light gets its power from an ign hot circuit, thru a light bulb or 12v led, then to the internal regulator.

When ignition is rotated on but engine not running, the regulator faults to ground lighting the light, once the engine is running and regulator and alternator are on line, light goes out. If the alternator faults during operation , this circuit shunts to ground turning the light on.

Anyway, i like the idea of a backup light indicator to go along with the gage. My gage is an ammeter converted to volt gage with a sun volt gage. I drilled a tiny #50 hole to the left of the D on the gage, and used JB weld to hold the 12V led in place on the back of the gage face. I soldered the positive wire for the led to the 12v feed stud on the gages internals, as thats the ign switched feed to the gage, and drilled a small hole in the cast metal gage housing to run the wire that will go out to the voltage regulator.

I like it because its bright enough to get your attention, but doesnt ruin the classic look of the rallye gage cluster with a big honkin LED. The pix dont do it justice as far as the brightness goes, it does get your attention though.

Matt