Sponsored

Need help - electrical

jbailer

Well-Known Member
Joined
May 1, 2015
Threads
43
Messages
3,270
Reaction score
1,297
Location
Maryland
First Name
Joe
Vehicle(s)
2015 EB Magnetic Premium PP 50AP
Really need some help for what should be a super simple project. I'm installing MP Concepts turn signals on my 15 Mustang. It's a basic install but I've spent forever on it and can't figure out what's wrong. It's only 3 wires; 1 goes to the headlight connector, and the other 2 tap into the turn signal connector. I've checked everything like 15 times. My only guess is it's not like old school lights where you have ground and 12V and it's either there or it isn't. The driver's side works fine but I can't get the passenger's side working.

The black wire from the light goes to the black wire on the turn signal on both sides. The yellow wire from the light goes to the blue wire on the driver's side and yellow wire on the passenger's side (same wire position). The white wire goes to the light gray with purple stripe on the headlight connector on both sides.

At first I used the vampire quick clips included. When it didn't work I checked with an ohm meter and tested through the headlight connector/turn signal connector all the way through the new connector that goes to the new turn signal and got 0 ohms for all 3. After an embarrassingly long time working on it, I decided to get rid of the vampire clips and soldered the wire in. I've rechecked many times and have good continuity all the way through. I even went as far as putting a pin through the insulation right near the light housing and connecting the multimeter there all the way back to the connector they are tapped from, all good.

I've taken the passenger's side light and plugged it in on the driver's side and it works fine. I've even plugged the old light into the now unused turn signal socket and it still works fine. I'm at a loss and really could use some help. Please?
Sponsored

 

Cobra Jet

Well-Known Member
Joined
Feb 12, 2015
Threads
771
Messages
17,554
Reaction score
19,982
Location
NJ
Vehicle(s)
2018 EB Prem. w/PP and 94 Mustang Cobra
I don’t know if this will help you but here’s the headlamp wiring diagrams:
7249E7A0-F64A-4C1D-813C-4C0BC96E165F.webp
C86544C4-3DF1-4719-ABE3-C9A32C83718B.webp
717216DB-672F-4767-A8EC-16EF09A73D3F.webp
CD8D6AA4-A9CE-4A97-9892-2A2B6274DE1A.webp
F4255642-924B-45A0-B5A9-C7390F0BF718.webp
3BBC4BD8-93B1-4185-AB4A-6DAF915908D7.webp
559371AF-BE41-436A-98C1-86AF376F672E.webp
1294F9CB-0DC6-4444-9246-B0ED678A7F23.webp
F44E806B-88F7-4F31-AD04-5B6B6DC64AA3.webp
A74ECBAC-2CB4-482A-B666-41E7FD5D5B29.webp
 
OP
OP
jbailer

jbailer

Well-Known Member
Joined
May 1, 2015
Threads
43
Messages
3,270
Reaction score
1,297
Location
Maryland
First Name
Joe
Vehicle(s)
2015 EB Magnetic Premium PP 50AP
I don’t know if this will help you but here’s the headlamp wiring diagrams:
Thanks Cobra Jet. The diagrams that MP Concepts provided were very clear and only having 3 wires, this is really baffling me. The problem is, I'm confident the light works because I plugged it into the driver's side and it works. I'm confident I have the wiring connected to the correct wires, it's the same on both sides. I've soldered the connections and tested continuity all the way through all connections. I'm just at a loss as to what could cause this.
 
OP
OP
jbailer

jbailer

Well-Known Member
Joined
May 1, 2015
Threads
43
Messages
3,270
Reaction score
1,297
Location
Maryland
First Name
Joe
Vehicle(s)
2015 EB Magnetic Premium PP 50AP
After all that time beating my head against the wall i figured out it's something to do with the computer and as I thought, there's nothing wrong with the wiring. Now I'm in a new kind of hell trying to figure that out...

Going to post for help in the DIY forum.
Sponsored

 
 








Top