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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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Light switch problem.Views : 13000 Replies : 17Users Viewing This Thread : |
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Jul 25th, 2010, 00:21 | #1 |
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Location: Co. Cork, Ireland.
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Light switch problem.
Hello everyone. I have a recurring problem with my light switch. It works the lights fine but has a problem with lighting the gauges inside the car. I have replaced it a couple of times and the latest one is playing silly beggars now as well. No amount of twisting it is working this time. I remember someone saying on here before that you could cross two of the connections so that the gauges light up fully when the lights are on, there by bypassing the adjusting function. This is what I want to do. Can someone tell me which connections to connect? And any ideas about the best way to do it? Below is a pic of my original switch which should help with the description. Many thanks. Hugh.
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1970 Volvo Amazon 131 with a B20A and an M40. |
Jul 25th, 2010, 11:42 | #2 |
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I think you'll find that it's the pair at 11 and 1 o'clock, the outer ones of those 3. Even if that switch is duff it'll probably show something on a meter if you check it. Turned to one extreme it should be open circuit, that is the dash lights off position. A couple of inches of wire with a piggy back crimp on each end that duplicates the spade will do the trick.
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Jul 25th, 2010, 12:35 | #3 |
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Location: Connecticut, USA
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Alf Ista;
I have to disagree with Derek on this one......he is suggesting tying together 30 and 58...I don't believe that will bring the desired result...30 is power coming into the switch and 58 is the parking light output... I'm referring to wiring diagram here: http://www.sw-em.com/122S%20Wiring%20Diagram.jpg Terminal list for Light Switch with function and color codes: 30 - Power input (2 Blacks) 58 - Parking Light output (White) 56 - Headlight output (Yellow) 58b - (Full) Instrument Lighting Input from Fuse 3 and output to one nonvariable (2 Whites) 58a - Variable Instrument Lighting output (3 Reds) ...unfortunately, the variable output terminal which powers the Instrument Lighting is not numbered in that drawing...but by the process of elimination, (and you should be able to confirm this by checking colors of wiring connected to your Light Switch), I believe the terminal of interest to be 58a (at 7o'clock)......so by my reckoning, taking the 3 Reds from terminal 58a and tying them to 58b, will bring the desired result of bypassing the variable function. The make special "piggy-back" terminals which plug onto a single male contact and which have two males themselves which I would recommend using for this. Note: After this modification Fuse 3 will continue to protect all non-variable Instrument Lighting, and an increase in fuse current rating (from 8A) is not required by this change. Cheers from Connecticut! Last edited by Ron Kwas; Jul 25th, 2010 at 12:41. |
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Jul 25th, 2010, 13:20 | #4 |
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Thanks Derek and Ron. Indeed, I checked the switch that is on the car at the moment and all the colours and wires match Rons list, except for 58a; I have only 2 reds on here, not 3. Looks original wiring and all works fine, maybe different this side of the pond?
Currently, I have some extra gauges fitted and the power to lights from these is piggybacked off 58a like Ron says. So, if I move all wires from 58a to 58b that should do the trick. I have those piggyback terminals as well. Will try it today and let ye know how it goes. Hugh.
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1970 Volvo Amazon 131 with a B20A and an M40. |
Jul 25th, 2010, 16:17 | #5 |
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I wrote out a reply which said that I thought that the 2 lower tags at 7 and 5o'clock were the likely ones and then remembered that I had a spare switch here at home. With a meter, the only 2 contacts that I could get any readings at all on were the ones I posted. These readings weren't very consistant but I've never had it on a car so don't know the condition of the rheostat. Yes, I have been told not to assume things when doing this sort of check but I did so this time. If you drop the switch out of the dash, assuming(!) there is enough slack, it should be easy to bridge the terminals to check. A dark garage will help!
Good info Ron. I've got a mail to write to you about red light problems on an ES. I'd appreciate some insight if you've a few minutes. |
Jul 25th, 2010, 16:34 | #6 |
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Location: Connecticut, USA
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Hugh;
That slight inconsistency with number of Reds may indeed be due to sight variations which occur, but as a rule, you can trust the oe color codes...you may even be able to verify colors on terminals in-situ without removal from dash...this will take a flashlight (torch) and some contortions, but is certainly doable also... Derek; I value your inputs on this and Brickboard Forums...and everyone can make an honest mistake...the trick is not to devolve into a personal attack, and I am very careful not to when disagreeing with someone...I've found both Fora civil and pleasantly proper that way...thankfully(!), in comparison to others out there...of course were all adults here which is not what can be said of other places out on the web...as far as your electrical issue: Fire away (...did I say Fire?)...I'll try to help...and like I always say: If I don't have an answer, I'll usually have an opinion! Cheers from Connecticut! |
Sep 4th, 2010, 22:22 | #7 | |
Amazoniste
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Quote:
Thanks!
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Paul - 1967 Amazon 222S B20 o/d Estate & 1961 A-H Sprite Mk2 948cc WANTED - For '67 Amazon estate - offside rear quarter, preferably new old stock. |
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Sep 5th, 2010, 13:59 | #8 |
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If you have bypassed the dimmer as shown, it doesn't matter because 58a and b are now one and the same node. If you have NOT bypassed the dimmer and wish to connect aux instrument lighting, you must first make the choice of connecting to the non-dimmed node (58b) or the dimmed node (58a).
Cheers from Connecticut! |
Sep 9th, 2010, 22:12 | #9 |
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I have been following this thread with interest as I am at the stage in my rebuild where I am tackling lights. The current position is that my front lights work but the instrument lighting and rear lights do not. Rons explanation of the number codes against the light switch terminals has moved me on a bit and I suspect that the wires of interest in this case are the two white ones but I'm not quite there yet. Words of wisdom and experience always welcome.
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