left turn signal problems, feel like i have tried everything Options

[jeff dodge]

I am having trouble with my left turn signal. Let me detail; ground tested and is good, replaced , replaced column switch, new relays, new bulbs, swapped housings from left to right, new fuses. noticed that when I clicked the emergency flashers it blew that fuse. Right works fine, the left turn filament is very dim and the read does not do anything. I have spent two weeks trying to track this down. I have built entire harnesses for vintage race cars and this has me baffled. Please help! Thanks, Jeff

[jim_hoyland]

There’s a possibility the TS switch has a short inside.
To verify; remove the switch. Test from the bottom. There are 2 rows of round terminals. One row for turn signals, the other row for parking lights.
The center terminal of each row is power in; the terminals to the right and left of center correspond to the left or right signals.
To test: put one MM probe on a center terminal, move the switch handle to left or right and see if there is continuity.
If you get continuity for both sets of terminals, the switch is ok.

[Dave_Darling]

A dim light says to me that you've got either a grounding problem, a high resistance connection, or a couple of wires swapped.

How sure are you that you've dealt with the grounds?

Have you matched up the wires on the front AND REAR turn signal buckets with Jeff Bowlsby's diagrams?

https://bowlsby.net/914/Classic/TechNotebook.htm

--DD

[jeff dodge]

A dim light says to me that you've got either a grounding problem, a high resistance connection, or a couple of wires swapped.

How sure are you that you've dealt with the grounds?

Have you matched up the wires on the front AND REAR turn signal buckets with Jeff Bowlsby's diagrams?

https://bowlsby.net/914/Classic/TechNotebook.htm

--DD

Thank you for your reply. I have checked the ground connection at the front where the 4 prong terminal is located behind the left front headlight, all is good. I am not sure if there is a separate ground location at the rear. The left front and rear parking lights work powered by the grey w/black stripe. The black w/white stripe has been compromised somewhere. I have checked every fuse, relay, column switch and wiring that I can get my hands on. My next step will b to run jumper wires to bypass the black w/white wire to the left front/rear light housings. Keep in mind that the right turn signal fuction. Thanks again, Jeff

[Spoke]

I am having trouble with my left turn signal. Let me detail; ground tested and is good, replaced , replaced column switch, new relays, new bulbs, swapped housings from left to right, new fuses. noticed that when I clicked the emergency flashers it blew that fuse. Right works fine, the left turn filament is very dim and the read does not do anything. I have spent two weeks trying to track this down. I have built entire harnesses for vintage race cars and this has me baffled. Please help! Thanks, Jeff

What was changed before this issue came up?

You may want to completely disconnect the front and rear light housings and test. At a minimum, remove both left side bulbs.

' the left turn filament is very dim and the read does not do anything.'

The left side might have a near short which would allow just a little voltage to the bulb. Is the front dim and the rear out completely? The short may be in the rear housing wiring. Again it might be prudent to remove all wires from the rear and see if the fuse blows.

A guy brought his 911 to me where he had to put a 25A fuse in the left side turnsignal to keep it from blowing. The front turnsignal was dim and the rear was out. The fuse was getting hot. We disconnected the rear wire at the fuse panel and the front turnsignal got bright as expected and the fuse was cool. There was some short in the rear housing.