Re: Brake light fuse blows when lights are on, brake pedal pushed and
Bad turn signal switch. 1157's are dual filament. One filament is tail/park and on all the time via h/lamp switch, brown wire.
The other is stop, drvr is yellow, pass is dark green.
When brake is selected, stop comes on via brake light switch thru turn sig sw.
When turn is selected, stop blinks, brake circuit broken and t/s comes into play.
When brake is on, turn is selected, stop goes out, then stop blinks, supply from blinker.
Only one filament on at any time. For '67, Tail/park/stop are one fuse, '68-'70, stop is one fuse, tail/park/marker is another fuse. All fuses mentioned are 20 amp.
Check ground continuity at the rear bezels. If not a good connection, less than 1 ohm, more resistance in the circuit, more current needed, blows fuse. Spark at turn sig switch is not normal. At the steering column connector or drvr kick panel connector, measure each rear stop circuit to ground, both should be the same resistance, might even compare it to the front to get a reference.
Might even change the blinker, easier.
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