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Old 23 March 2012, 15:03   #1
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Electronics / switch query

Its been a long time since I played about with switches.....can someone help me out please?

I need to replace a missing switch on the Pac..... They are /need to be IP 67 rated and the majority of them are APEM 3641 off /on type (easy ) Like this.... 3641NF/2 - APEM - SWITCH, DPST, IP67 | Farnell United Kingdom

BUT, I need a switch to work the dash illumination lights.... It works Off /On (1/2 brightness) / On (full brightness)

I can't find the switch I need in the Farnell catalogue and tbh don't know what it's called.... Can ayone help with type and if at all poss / a seller? Apem /looking the same if at all poss....

Thanks v much in anticipation
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Old 23 March 2012, 15:18   #2
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Switch

I am in no way an expert but could it be an

Off/On/On

with some kind of resistor wired into the circuit of the On 1/2 brightness as required ??
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Old 23 March 2012, 15:44   #3
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Sorry Karl, was unclear from my post.... You are correct it is an Off /On /On i'm after (the 1/2 brightness and full brightness is a red herring.....was just to describe what the switch does)....

I can find On/Off/On but that doesn't work with the engraved labelling on the panel....

Anyone?
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Old 23 March 2012, 16:33   #4
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Just go on/off with a separate dimmer dial.
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Old 23 March 2012, 17:05   #5
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Quote:
Originally Posted by ncp View Post
Just go on/off with a separate dimmer dial.
The instr. panel is engraved with Off, 1, 2 and I wat to stick with that..... adding a dimmer would mean finmding a space on apretty cramped panel.....want to stick with original spec..... the switch must be available somewhere, just can't find it.......
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Old 23 March 2012, 17:17   #6
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You need a 2 speed wiper switch.
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Old 23 March 2012, 18:32   #7
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Quote:
Originally Posted by Downhilldai View Post
You need a 2 speed wiper switch.
Just about to say that!
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Old 23 March 2012, 18:42   #8
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Quote:
Originally Posted by Downhilldai View Post
You need a 2 speed wiper switch.
I wonder how they work? The switch on my Defender is playing up and I need to sort it out...
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Old 23 March 2012, 19:24   #9
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Presumably the double speed wiper switch still needs to be waterproof? and I gathered he wanted to keep the same design.

It looks like an ON-ON-ON would do the job - you just don't connect the first ON! There is an APEM that will do that: 3644NF Can't see a UK supplier who supplies in qty < 25.

IP67 Toggle with ON-OFF-ON (would mean relabelling the panel) but roughly similar in style to previous: (but would be I-O-II instead of O-I-II)
WT13L - NKK SWITCHES - TOGGLE SWITCH, SPDT, IP67, ON | Farnell United Kingdom
But has same 12mm hole etc to fit.


IF it doesn't need to be a toggle would this do the job?
1939.3119-04 - MARQUARDT - SWITCH, DPDT, IP65, BLACK, I/O | Farnell United Kingdom
(The picture is wrong it should show I O II on the switch)

The dimming function is almost certainly down stream from the switch...
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Old 23 March 2012, 19:27   #10
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Quote:
Originally Posted by willk View Post
I wonder how they work? The switch on my Defender is playing up and I need to sort it out...
I think they work by connecting to a different part of the commutator e.g. full speed connects at positions 12 & 6, part speed connects at 12 & 3.

So it might not be the switch it could be the brushes.
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