Some electrical trouble....

13 posts / 0 new
Last post
Aerial_stu
Aerial_stu's picture
Offline
Last seen: 5 days 6 hours ago
Joined: 14/06/2021
Some electrical trouble....

Thankfully I passed my MOT two weeks ago, because now I have a problem.

Any ideas where to start would be gratefully received.

When I turn my headlights / sidelights on, my left indicators also come on (solid, not flashing) - which I was alerted to because of the horn repeater.

Also noticed, when I turn my left indicator on (when no headlights are on) all the dash lights go on and off as the indicator flashes.  

Flipping heck, where do I start?

Thanks

Wrightpayne
Wrightpayne's picture
Online
Last seen: 3 min ago
Joined: 17/04/2014

My money on an earth issue - check the headlight bowl earth points and chassis earths (battery to engine, engine to chassis, o/s front brake union and wiper motor)

Jonathan Kay
Jonathan Kay's picture
Online
Last seen: 2 min 47 sec ago
Joined: 17/04/2014

Wow!

  1. What's a horn repeater?
  2. Has there been any work on it since it was all OK?
  3. Have you got a multimeter and would you like a wiring diagram?
  4. Checking earths is a good idea, and I'd add the instrument earthing point to that list. 
  5. Work the hazard warning light switch on and off a few times... has that made any difference?
  6. Remove all of the side and tail bulbs. Switch the sidelights on... does the left indicator still come on?
  7. Remove all of the indicator bulbs. Turn the left indicators on... do the instrument lights still come on?

Jonathan

Aerial_stu
Aerial_stu's picture
Offline
Last seen: 5 days 6 hours ago
Joined: 14/06/2021

Thanks for initial comments, I'll have a go at these at the weekend.

a horn repeater?  Its the buzzer/ horn that makes a noise when the indicator flashes.

Stuart

Regards,

Stuart

Jonathan Kay
Jonathan Kay's picture
Online
Last seen: 2 min 47 sec ago
Joined: 17/04/2014

Thanks: was that there well before these problems?

Jonathan

Aerial_stu
Aerial_stu's picture
Offline
Last seen: 5 days 6 hours ago
Joined: 14/06/2021

Yes, it's just the normal buzzer when the indicators are on.  

Regards,

Stuart

Jonathan Kay
Jonathan Kay's picture
Online
Last seen: 2 min 47 sec ago
Joined: 17/04/2014

Thanks

Jonathan

timb2117
timb2117's picture
Offline
Last seen: 1 day 15 hours ago
Joined: 26/04/2020

Also check battery connections are clean, bit of grease and tight, I spent months chasing round to find it was a simple earth lead on the battery.

Would they have disconnected anything at the MOT and re connected it badly - potentially causing the fault?

Otherwise stick with the guys comments above -probably spot on, spend a lot of time looking and wiggling (the terminals :)) prior to removal and checking you may well see looseness.

ACFowles
ACFowles's picture
Offline
Last seen: 3 hours 20 min ago
Joined: 21/06/2021

I would check the wiring and earthing of the tail lights.

I've seen situations where a bad earth causes the tail light to track back to earth via the indicator lamp.

Jonathan Kay
Jonathan Kay's picture
Online
Last seen: 2 min 47 sec ago
Joined: 17/04/2014

Yes. That's the family of faults where pulling bulbs can be a useful part of the diagnostic approach.

Jonathan

TJG
TJG's picture
Offline
Last seen: 2 hours 53 min ago
Joined: 17/04/2014

Might be worth a look at wiring loom in rear arches etc for chafing against tyre causing bridged wiring.