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Author Topic: Headlight Troubleshooting - any further tips?  (Read 559 times)

JimmyGermany

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    • 1993 Capri non-turbo
Headlight Troubleshooting - any further tips?
« on: April 02, 2021, 04:10:13 PM »

Gentlemen,

I've got one headlight which has stopped flipping.

Today, I started troubleshooting.
Attached the electric motor directly to the battery, runs non-stop (as expected).
When attached to the plug normally, nothing.
Replaced control unit with a (used) spare - same result.
I cannot measure any signal at the plug when activating the switch. (Should I be able to?)

https://ibb.co/d5HFLwM

This is the connector in question - the previous owner spliced EVERY SINGLE WIRE - this is currently my prime suspect.
Should I be able to measure continuity between the plug contacts and the connections that to TO the control unit?

I'm kind of at a dead end and hoping for a tip.
Happy Easter to all!

Cheers
James
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greywolf27030

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    • 1991 XR2, 1992 XR2, 1993 XR2
Re: Headlight Troubleshooting - any further tips?
« Reply #1 on: April 03, 2021, 07:55:00 AM »

There is a clock spring in the light housing that controls the up and down movement. It is packed with grease from the factory and over time it is common for the grease to turn to wax and be non-conductive. A simple disassembly and cleaning gets them back going.
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Jack Byrd

JimmyGermany

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    • 1993 Capri non-turbo
Re: Headlight Troubleshooting - any further tips?
« Reply #2 on: April 03, 2021, 11:53:43 AM »

Hello!

Do you mean within the motors? I did that.
Cleared out the gunk and replaced with silicone grease.
The motor runs fine when connected to the battery directly.
There seem to be no current reaching it through the plug.

Should I be to measure the signal from the plug when using either switch? (I tried with the DMM but it shows nothing)

Should I be able to measure continuity from the contacts in the plug to the plug that goes into the control unit?

As a last resort, is it possible to make a new partial wire harness from the control unit to the one headlight? This is my least favourite option, because Iím lazy.

Happy Easter to you ALL!
James
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Rocketman

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Re: Headlight Troubleshooting - any further tips?
« Reply #3 on: April 03, 2021, 05:05:34 PM »

I think the only thing you'll be able to reliably test is the motor windings thru the plug.

The other contacts in the motor plug are from the rotary switch, and continuity from those will depend on the motor's position.
The plug for the control unit in the vehicle probably won't show you much by probing it. It's going to "Read" the motor position and send power to the motor depending on its position information.

There may be some information, or at least wiring diagrams that can help you in the factory service manual. www.techcapri.com
« Last Edit: April 03, 2021, 05:08:01 PM by Rocketman »
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


JimmyGermany

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  • On the search for parts less broken than mine :-)
    • 1993 Capri non-turbo
Re: Headlight Troubleshooting - any further tips?
« Reply #4 on: April 06, 2021, 02:13:59 PM »

Gentlemen,

Perhaps a silly question: are there different LEFT and RIGHT motors?
And, if yes, how can you tell them apart by looking at them?
I've seen listings mentioning the side, and some saying they are interchangable.

Gonna have to find a Pro to deal with this problem.
I think I've done all the poking I dare to :-)

Cheers
James
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