targa 200 amp led turns on and off under a load

this is an old targa hexfet 2ch 200 watts amp.when rca.s installed and speaker wires hooked up it is fine. when it is turned up , the power led turns off and on. the output transistors and power supply transistors do not get hot
 

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the power supply goes from 13.69 at idle. When i turn up the radio im using for a signal, it doesnt drop below 13.49 vdc. im using a fluke 117 meter with leads on power terminals of amp.its a little intermittant. sometimes it will work for a minute. and after testing, i touched the power supply and output transistors and they are barely warm
 
C#
Pin 1: 2.7
Pin 2: .1
Pin 3: 4.9
Pin 4: 0
Pin 5: 1.5
Pin 6: 3.7
Pin 7: 0
Pin 8: 12.4
Pin 16: 2.1
Pin 15: 4.9
Pin 14: 5.0
Pin 13: 13.5
Pin 12: 13.5
Pin 11: 13.12
Pin 10: 0
Pin 9 0
the light and the sound only cuts off for a little less than 2 seconds
 
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normal voltages with light and sound not cutting off are as follows for the ic>
Pin 1: 2.7
Pin 2: 2.9
Pin 3: 1.79
Pin 4: 0
Pin 5: 1.56
Pin 6: 3.7
Pin 7: 0
Pin 8: 12.44
Pin 16: 3.7
Pin 15: 3.7
Pin 14: 5.0
Pin 13: 5.0
Pin 12: 13.56
Pin 11: 12.49
Pin 10: 3.7
Pin 9 3.81
 
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