Author Topic: Light issues, parks and turn signals  (Read 7189 times)

Offline 1967KaiserM715

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Re: Light issues, parks and turn signals
« Reply #15 on: August 04, 2017, 08:23:47 PM »
Dark blue-right front turn and side marker.

Light Blue- left front turn and side marker.

In either test, did the dash turn indicators illuminate?  Did any dash lamps illuminate?


Only have 6v on ppl wire coming into turn switch- also realized the left turn works with key off and out-never put the key in today.

Does the PPL wire measure 6 volts with the key ON or OFF?  So, the left turn works only with the ignition OFF and the right turn never works, yet all four corners and dash indicators flash normally when the hazard flashers are ON, regardless of ignition being ON or OFF?

Dash Indicators did not light-BUT further playing around, I noticed they stopped coming on with Hazards, I will check tomorrow and replace bulbs. I did not notice any other dash lights that lit up when probing the the Dk/Lt blue wires.

6 volts with key on, 0 with key off. Brn wire in is at 11.7 volts, key on or off.

Left turn works with Ignition ON or OFF, Right turn never works, Hazards work normally with Ignition ON or OFF.

The last thing I did tonight was switch Flashers again-and the left turn still worked-with the turn signal Flasher removed, but Hazard Flasher installed.

I believe there is a short between hazard power in and my left turn in the original turn signal switch, which would explain why the new switch, the turns never work, but hazards function normally.
Current Vehicles:1985 GMC K10(Daily) 1991 GMC K2500(Daily) 1975 Beetle(not running) 1985 Mercedes 300D(not running) 1952 M35    1967 M715(not running)
 1986 Chevy K30(under repair)

Online bd

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Re: Light issues, parks and turn signals
« Reply #16 on: August 04, 2017, 08:56:16 PM »
With the turn switch still disconnected, jumper between PPL and Dk BLU (ignition OFF then ON), then jumper between PPL and Lt BLU (ignition OFF then ON).  Describe what happens.
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 1967KaiserM715

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Re: Light issues, parks and turn signals
« Reply #17 on: August 05, 2017, 08:44:13 AM »
With the turn switch still disconnected, jumper between PPL and Dk BLU (ignition OFF then ON), then jumper between PPL and Lt BLU (ignition OFF then ON).  Describe what happens.
Ignition ON- PPL to Dk BLU=right front and indicator flash, PPL to Lt BLU=left front flash

Ignition OFF- nothing on either circuit.

Dash bulbs were bad, retesting by supplying direct voltage to Dk BLU and Lt BLU, no extra lights, dash indicators work.

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Current Vehicles:1985 GMC K10(Daily) 1991 GMC K2500(Daily) 1975 Beetle(not running) 1985 Mercedes 300D(not running) 1952 M35    1967 M715(not running)
 1986 Chevy K30(under repair)

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Re: Light issues, parks and turn signals
« Reply #18 on: August 05, 2017, 11:52:17 AM »
Both dash indicators are tied directly into the front turn lamp feeds.  So, both dash indicators are working correctly since being replaced?  That's good news!  There doesn't seem to be any wiring issues in the forward turn lamp circuits from the dash harness connector forward.

Repeat the test by powering the rear lamps.  With the turn switch still disconnected, jumper between PPL and Dk GRN (ignition OFF then ON), then jumper between PPL and YEL (ignition OFF then ON).  Describe what happens.
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 1967KaiserM715

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Re: Light issues, parks and turn signals
« Reply #19 on: August 05, 2017, 01:28:08 PM »
For the rear, if probing individually-nothing on either circuit, ignition on or off. If I however touch both Dk GRN and YEL at the same time ignition ON, both rears will flash.

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Current Vehicles:1985 GMC K10(Daily) 1991 GMC K2500(Daily) 1975 Beetle(not running) 1985 Mercedes 300D(not running) 1952 M35    1967 M715(not running)
 1986 Chevy K30(under repair)

Offline 1967KaiserM715

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Re: Light issues, parks and turn signals
« Reply #20 on: August 05, 2017, 01:38:28 PM »
New switch now works, don't know what happened, and the old used switch I thought was bad works on turns as well (hazard portion does not though).

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Current Vehicles:1985 GMC K10(Daily) 1991 GMC K2500(Daily) 1975 Beetle(not running) 1985 Mercedes 300D(not running) 1952 M35    1967 M715(not running)
 1986 Chevy K30(under repair)

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Re: Light issues, parks and turn signals
« Reply #21 on: August 05, 2017, 01:52:43 PM »
There is probably an intermittent short under the dash - wires chafed or melted together.  Moving the wires around while probing "temporarily" separated the shorted circuits.  Carefully inspect for chaffing and other damage.  Pay particular attention to any wiring modifications you made or wires you relocated under the dash for the diesel conversion.  Disassemble and check between the fuse box and firewall bulkhead connector, as well.  Look for any wires that maybe pinching from brake and/or clutch pedal arm motion, etc.  There also could be damage to the turn switch wiring running up the column that is integral with the old 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)

Offline 1967KaiserM715

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Re: Light issues, parks and turn signals
« Reply #22 on: August 05, 2017, 05:58:17 PM »
So checked wiring, untaped up to fuse box, nothing seemed amiss, I did not remove fuse box, but if the issue arises again(soon again) then I will pull it,

but put the new switch in, there was quite a bit of rust on the steering wheel-which likely explains why the horn wasn't working. I destroyed the wiring and plug trying to remove the old switch, it is quite dirty, and there does appear to be a little corrosion-hard to tell without fully dismantling.

Upon putting everything back together, the wiper motor started to work as well, kind of a surprise when I turned the key to ON, and there is this strange whirring noise (no blades or arms on yet.)

So I think I can say that the old switch was bad, as for the new switch not working right away...maybe I didn't have the plug tight enough? Or the gremlin decided to take a nap.

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Current Vehicles:1985 GMC K10(Daily) 1991 GMC K2500(Daily) 1975 Beetle(not running) 1985 Mercedes 300D(not running) 1952 M35    1967 M715(not running)
 1986 Chevy K30(under repair)