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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars

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Rear light bulb fittings

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Old Jul 10th, 2019, 02:35   #11
Ron Kwas
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Damien;

Welcome to this forum also from me...I've been away and am just catching up...and there is a lot in this thread I would like to comment on...

First of all, if all you need is a round insulating washer like that with two holes, I see little to keep you from making up one using fibreglass reinforced circuit board material (use those present as a dimensional guide)...and as another option to Derek's advice on wire termination, modifying a solder terminal as I also needed to do...see link which covers a restoration of a 122 rear light fixture: http://www.sw-em.com/Amazon_Rear_Lig...estoration.htm

Wire gauge for the lighting circuits is 18. Soldering is always preferred for permanent repairs, but properly crimped with ACZP on wire-strands and crimp is a good second best (both result in Gas-Tight-Joints).
(See: https://www.sw-em.com/Wiring%20Notes.htm ...and http://www.sw-em.com/anti_corrosive_paste.htm)

Conjecture is fine in the pub over a pint, but when it comes to locating and eliminating issues, especially on important safety equipment such as Brake Lights, proper troubleshooting is better IMO...Brake Light Switch provides (Ign) power and chassis return path is local at the rear fixture (so I fail to see how ANY poor chassis connection could cause the stated symptoms). Reference amazon Wiring Diagram: https://www.sw-em.com/122S%20Wiring%20Diagram.jpg )...with Ign ON, have a helper verify Brake Lights are ON (with Brake Pedal at rest)...disconnect one wire at BLS (Early is Hydraulically activated and located on Brake Distribution Block in engine compartment, post '66-'67 is mechanically activated by Brake Pedal Arm and located in driver's footwell), .if they are ON when BLS is connected (Light Fixture issues notwithstanding), this suggests a shorted/welded contact within BLS. Replace BLS, but be aware of reliability issues with these switches and have a look at this Bulletin: https://www.sw-em.com/safety_bulletin_1.htm

Hope that helps...Good Hunting!
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Old Jul 11th, 2019, 09:53   #12
Damoyorkie
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Thanks Ron,

And for your help in the email. Cannot wait to receive the switch.

I’m hoping to get the soldering done this weekend so will let you know.

Cheers

Damien
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Old Jul 20th, 2019, 10:00   #13
Damoyorkie
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It turned out to be the brake light switch

I rewired the rear lights, soldering and heat shrinking the joints, and sourced new contacts from Furneaux Riddall : https://www.furneauxriddall.com/acat...3.html#SID=927

I also followed Ron’s magical advice of using aluminium tape to boost the brightness of the reflectors.

The BLS replacement was the final fix, but I also ordered Ron’s pedal switch to make sure that the same problem does not occur again. I will
Fit it in the next couple of weeks. Check this out for service: I ordered from Ron on Sunday evening, and the full kit arrived in North Yorkshire from The States on Wednesday.

Many thanks to all the members who helped me out. I do love this place and the people on it.
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Old Jul 20th, 2019, 14:23   #14
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Damien;

I'm happy that trouble locating and repairs worked out...and agree, that is an impressive, best case scenario on shipment...as a point of information, it was a padded (thick) envelope...perhaps those get faster auto-handling than parcels...!

May all your difficulties with your car be as simple...thanks for the kind words...Cheers!
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