Several years ago Car Craft had a article about running the headlight circut thru a relay. These older GM's had a problem of melting the wiring under the dash mainly due to the current thats routed thru them for the starter and headlight circuits.
Check your headlight switch for excessive resistance that could be the cause of your drop
------------------
Philip Mullaly
72 TPI El Camino
You can never fix a Ford,You can only work on them alot.
70 442
The Z-meano
Cowl induction injection
Check your headlight switch for excessive resistance that could be the cause of your drop
------------------
Philip Mullaly
72 TPI El Camino
You can never fix a Ford,You can only work on them alot.
70 442
The Z-meano
Cowl induction injection