ASSUMING your 123 is wired as this drawing from the Tech Library,
and ASSUMING you are confident that your battery is good....
Since you have no headlights and the yellow headlight wire is connected to the same large
post on your starter solenoid that battery cable is on, one would have to ASSUME that battery voltage is not getting to that post.
The cause would likely be dirty connection on that post or a bad battery cable.
Clean that post and all terminals connected to it and check for a solid 12 volts on that post.
If no 12 volts, replace the battery cable or at least the terminals on each end.
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