Author Topic: Turn signal fuse power  (Read 1036 times)

Offline 83k10silveradooo

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Turn signal fuse power
« on: November 02, 2021, 01:14:36 AM »
First off, I wanted to say thank you for adding me to the community.

My problem is that, I have no power on the turn signal fuse or flasher. I traced the brown wire from the turn signal fuse on the fuse block, to the ignition switch, and that brown wire has no power. Brand new ignition switch, the truck will turn over and run so I know that at least  part of the ignition switch works.

I have headlights, taillights, marker lights, brake lights work, but can't for the life of me figure out why there's no power to the turn signals. Headlights and taillights are both LED, and I bought LED flashers for the hazards and turn signals.
Turn signal switch is brand new as well. Any help is appreciated, thank you

1983 Chevy k10, 350sbc 4 bolt main

Offline bd

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Re: Turn signal fuse power
« Reply #1 on: November 02, 2021, 03:46:50 AM »
Does the truck have an OEM or aftermarket cabin wiring harness?  The OE brown wire from the ignition switch is accessory power.  The turn signals are powered by the ignition circuit.  Is there power in the IGN tap cavities along the left side of the fusebox?
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline 83k10silveradooo

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Re: Turn signal fuse power
« Reply #2 on: November 02, 2021, 01:31:24 PM »
Sorry, I should have added this info in my original post. the truck has an aftermarket wiring harness, where there is no bulkhead connector. As for testing the fuse box, I wont be able to until Thursday.

Offline bd

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Re: Turn signal fuse power
« Reply #3 on: November 02, 2021, 03:12:24 PM »
So the correlation between the OEM and aftermarket wire color scheme, if any exists, maybe happenstance.

Unplug the ignition switch and inspect the plastic floor from which the switch terminals protrude.  Each terminal should be identified (e.g., BAT1/2/3, IGN1/2/3, ACC, GRD1/2, SOL).  Draw a map view of the terminal layout and note what color wires connect to each terminal.  Generally, there are two B+ feeds coming into the switch from the battery, 2-3 ignition out, one accessory out, one starter solenoid out, and two switched ground terminals.  The turn signals will be powered by either the IGN1 or IGN2 terminals; IGN3 is reserved for appliances that require power in the ignition switch "run" and "accessory" positions, but not in the "engine crank" position, for instance, power windows and A/C.  To which terminal does the turn signal fuse connect?

As you work, you can compare the aftermarket harness to the OEM 1983 Wiring Manual to determine just how much deviation exists.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline 83k10silveradooo

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Re: Turn signal fuse power
« Reply #4 on: November 06, 2021, 11:25:16 PM »
Any help is appreciated
Ignition switch wiring
Orange- Ignition switch acc
Red- Ignition switch power splices off to a Black wire for other ign switch connector
Pink- IGN switch coil
Purple- IGN switch start
Brown- Has no markings on wire but runs from Ignition switch to turn signal fuse which then jumps to the flasher, and the flasher jumps to the turn signal switch

The new ignition switch has no markings, but the old one
Terminals are marked G-I G-2 B1 B2 B3 S A I-1 I-5
Top left is pink top right is brown middle is red bottom left is purple on white connector, middle bottom is orange left is black on black connector

Pink is I-1 brown is A red is B-2 purple is S black is B-3 Orange is I-5
I figured out part of the problem, my truck is technically a 76 but the previous owner swapped everything over too 83, I originally thought it was an 82 so the wiring harness it it is 79-82 but the column is 83 so I swapped the orange and brown wire, now I have power to the turn signal fuse and flasher, but still no turn signals.
« Last Edit: November 09, 2021, 12:09:29 PM by 83k10silveradooo »

Offline 83k10silveradooo

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Re: Turn signal fuse power
« Reply #5 on: November 22, 2021, 11:12:43 AM »
There is power on the turn signal fuse and it jumps across to the flasher but the connector at the top of the flasher connector has no power on it to feed the turn signal switch

Offline bd

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Re: Turn signal fuse power
« Reply #6 on: November 22, 2021, 02:04:36 PM »
Replace the flasher.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline 83k10silveradooo

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Re: Turn signal fuse power
« Reply #7 on: November 22, 2021, 05:05:58 PM »
ok maybe the flasher is defective, it's brand new but ain't nothing unheard of. I will try that thanks

Offline bd

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Re: Turn signal fuse power
« Reply #8 on: November 22, 2021, 05:17:39 PM »
Remove the old flasher, replace it with a wire jumper between the fusebox terminals and see whether the turn signals illuminate constantly when selected using the turn switch.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Online 1980K20

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Re: Turn signal fuse power
« Reply #9 on: November 28, 2021, 11:53:31 AM »
My first LED flasher was "heavy duty", meaning minimum 2A, max 20A. What was I thinking? These LED measure in the milliamp. I found a different flasher for really low amps and it works great now.

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1952 International L112 - waiting for EV conversion
1967 Camaro - 250 six cyl, 200-4R
1980 K20 4x4 Fleetside - 350 SBC roller Cam, TH350

Offline 83k10silveradooo

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Re: Turn signal fuse power
« Reply #10 on: November 28, 2021, 11:57:50 AM »
Could you please link the flashers you bought?

Online 1980K20

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Re: Turn signal fuse power
« Reply #11 on: November 28, 2021, 12:06:58 PM »
I was afraid you'd ask that... I found it (I order from all over the place).

Optronics Optronics LED Flasher | OPT ALEDFBP | Qty: 1

From oreilly.

Mark

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1952 International L112 - waiting for EV conversion
1967 Camaro - 250 six cyl, 200-4R
1980 K20 4x4 Fleetside - 350 SBC roller Cam, TH350

Offline 83k10silveradooo

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Re: Turn signal fuse power
« Reply #12 on: November 28, 2021, 12:16:14 PM »
Thank you sir, I will look into it if these flashers I order a couple days ago donít work
I appreciate it

Online 1980K20

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Re: Turn signal fuse power
« Reply #13 on: December 27, 2021, 06:08:26 PM »
FYI I ended up having trouble with my flashers after i went 100% LED.  With one incandescent bulb in, it worked fine.  The LED vendor suggested I use their flasher since it has a relay embedded.  If you have trouble, you can check this out.   I ordered 2, one for the turn, one for the 4-way hazards.

https://upcarparts.com/electrical/flashers-modules-resistors/led-flasher-with-polarity-reversing-adapter-12v-90652
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1952 International L112 - waiting for EV conversion
1967 Camaro - 250 six cyl, 200-4R
1980 K20 4x4 Fleetside - 350 SBC roller Cam, TH350

Offline Mike81K10

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Re: Turn signal fuse power
« Reply #14 on: December 28, 2021, 12:08:46 AM »
You said it works with an incandescent bulb (original bulb). The LEDs may require a heavy duty harness with relays as does some headlamps.