4320 generator light

Been working on my 4320 I picked up last weekend
overall it is great shape my only problem is I can't
get the gen light to work. The alternator is charging
the batteries but the light does not come on with the
key turned on. The only way it works is if I ground
the blade on the side of the light but then the light
never goes off I have checked the wiring and it
seems good. It had Ac so it has an alternator that
has a regulater on the back of it. Just not sure what
I am missing. It has a purple and a white or gray
going to the alternator plug, the heavy wire going to
the alternator and then a wire that goes to the top of
the fuel pump. It doesn't seem to match what I have
in the manual. Any ideas? Thanks and no it's not
the compact one it's the big older 4320
 
Check the light bulb our 3020 was having the same problem and we changed the bulb and stated working I know sounds crazy
 
Here's the connections I'm working with
a228693.jpg
 
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