Another parking light question

[fiatslug87]

I've searched but I'm still stumped.

'89 MJ

1- Left front parking light will not illuminate (right is good)

2- Works when signaling/flashers, although dim (only one filament is on)

3- Left turn indicator dash light is on when parking/headlights are on

4- Bulb is OK (switched in one that worked)

5- Swapped in two other harnesses (I KNOW one worked when pulled 3 months ago) still the same

6- According to the wiring diagram (see below) the left uses pin 3, the right pin 8, and both share pins 4 & 5

7- Voltages were the same at pins 3 & 8 (engine side)

What am I missing? All three harnesses can't have the same bad socket or short, can they?

 

[alleydog]

I'm thinking you don't have a good ground at the left park light, so it feeds back through the turn signal filament and puts the indicator on. you can verify that by using a test light clipped to battery negative, and touch the pointed tip to the base of the left turn bulb. If it lights with the park lights on, you don't have a good ground.

[fiatslug87]

But wouldn't that mean all three harnesses have the same problem? I'll try it tomorrow.

[alleydog]

yes, it does. Its weird!

[fiatslug87]

I ended up replacing the socket with a functional one from a spare harnesses (I couldn't find a replacement at the local parts stores :grrrr: ), now it works properly. I guess all three harnesses had bad left sockets, what are the odds :hmm: ? Time to hit the Lottery???

[alleydog]

good to hear you got it fixxed. That was an odd deal to have all three bad!