Turn Signal Power

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sickchev

Full Access Member
Joined
Sep 28, 2022
Posts
214
Reaction score
680
Location
Ohio
First Name
Jason
Truck Year
1979
Truck Model
c20
Engine Size
5.7
I am looking for some turn signal help. I have tried the usual suspects but I'm a little confused about this one.

1977 C30 Automatic
Tested 12s volt on both sides of the glass fuse - Good
Tested 12 volts at the flasher (552 Round Style) - Good
Tested 12 volts up to the switch on the purple wire (on flat plug) - Good
New Turn signal switch installed because it was cracked at the turn lever.
When I turned on the 4 way flasher and all the park lights and turn markers flash, Dash indicators light up.
I do have Backup lights.
New Parts Installed. - Neutral Safety Switch, Turn Signal Switch

When I move the Turn lever for Left or Right signal the 12 volts at the purple wire drops to 0 Nothing Happens. When I put the turn lever back in the center neutral position 12 volts returns to the purple wire on the turn signal switch.
 

Hugger-4641

Junior Member
Joined
Apr 16, 2024
Posts
9
Reaction score
27
Location
TN
First Name
Jerry
Truck Year
1985
Truck Model
K20
Engine Size
350
Pull the fuse and check it for continuity to be sure it's good. With incandescent bulbs you can sometimes get a "phantom" 12v reading across the fuse that is actually being back fed thru the twin filament bulbs.
 

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