I did several searches and did not find. I have a 1983 300d turbo and the electric fan is not coming on. so unplugged the fan and hooked to a battery and it works. Is there a relay for this? if so where is it located?

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1937 Chevy pu
1983 300D Turbo (250K) Daily driver
1983 300D Turbo spare motor(250k)
1965 Chevy C-10