new to me 75 turn signal issue hlp

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DRCKISS

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Sep 20, 2021
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Location
alabama
First Name
james
Truck Year
1985
Truck Model
c/k10
Engine Size
5.7
I just got a 75 k10 that has had some previous electrical work not by me. i had front turn signals, none in the back so i dropped the column because i was going to install a new key swith, and now i have NO turn signals at all. but the lights to come on when i turn on the head lights. i replaced the plastic turn signal indicator in the column, and no change. not sure where to look
 

Strick

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Dunn, NC
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Harold
Truck Year
1979
Truck Model
C20 Crew
Engine Size
350
Look at the long bus plug on the column where the ignition switch is. The turn signal plugs in the the same area. It may be loose or disconnected entirely.

HS
 

Goldie Driver

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Houston, Texas
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Britt
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1980
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GMC K1500 Suburban
Engine Size
350
Do you mean you changed the turn signal switch?

If so, do you still have the old one?

Seems like 75 and prior take a different switch and there is an adapter plug that allows the newer switch to be used with the old harness. I am wondering if you new switch is completely plugged in.
 

DRCKISS

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alabama
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james
Truck Year
1985
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c/k10
Engine Size
5.7
They quit working so that's why I changed the part
 

75gmck25

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Northern Virginia
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Bruce
Truck Year
1975
Truck Model
K25 Camper Special TH350 NP203
Engine Size
5.7
When I replaced the turn signal switch on my ‘75 the switch they gave me did not plug into my wiring correctly. The spacing of the flat plug’s terminals was a little off. I ended up using crimp connectors to put the old plug on the new switch and it worked fine.
 

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