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Sept 12, 2016 21:14:16 GMT
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I wired up my Triumph 2000 to have overdrive in second but never thought of making it disengage. The gearbox is quite well spaced so having and extra gear between helped acceleration a bit if you could switch it OK while changing gear. It did slip a bit on overdrive second with the 2.5 engine I fitted though. If you could get it to disengage every time you changed gear and then engaged with a button or column mounted lever that would be great. Volvo fitted overdrive on some of their automatic cars, think 740's and 940's and I wonder if they have some sort of circuitry. What about a clutch mounted switch that disengages overdrive every time you operate it ? I looked at volvo briefly but didnt understand the circuit. Ill look again. clutch switch would be ok but i have a habit of clutch in every time I brake so I could end up disengaging when I don't want to. I am happy with the gearbox switch, I just want the dash switch to reset to off automatically. I'm sure this is simple. A one trigger latching relay that has a 'no volt return' or a module/circuit that replicates that. Ive built more complex electronics but I just cant find the right stuff to do this. Presumably as I don't realy understand exactly what I'm looking for.
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steveg
Posted a lot
Posts: 1,586
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Sept 12, 2016 21:28:15 GMT
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I have to think about electrical stuff a lot as I really struggle. I wonder if there is anything for Triumphs or MG's out there already. One thing I found with my car was that changing gear with overdrive engaged didn't feel quite right and if you forgot it soon reminded you. I've got Volvo wiring diagrams somewhere if you need anything else.
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Sept 12, 2016 21:31:25 GMT
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Sept 12, 2016 21:40:03 GMT
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That switch, and that circuit will both work.
Ive emailed a few suppliers of chinese modules to find out what their reset status is. If I have no joy there and local place cant supply an easy relay then ill probably build that logic circuit.
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Sept 13, 2016 19:02:04 GMT
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Can you use a gear knob from a late MG? They had the switch in the knob..
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93fxdl
Posted a lot
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Posts: 2,013
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Sept 13, 2016 22:10:09 GMT
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Would it be possible to adapt the circuit that a lot of moderns use for the rear fog lamps, Ttfn Glenn
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Sept 13, 2016 22:29:19 GMT
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I don't know what circuit that is. How does it work?
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93fxdl
Posted a lot
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Posts: 2,013
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Sept 14, 2016 3:28:07 GMT
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Last Edit: Sept 14, 2016 3:36:22 GMT by 93fxdl
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Rich
Club Retro Rides Member
Posts: 6,303
Club RR Member Number: 160
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Sept 14, 2016 6:34:53 GMT
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That seems more or less the ideal relay for something similar to the diagram I laid out. Good find!
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Sept 14, 2016 6:50:41 GMT
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That looks promising. I don't get why it has a rocker switch and not a momentary though.
You switch on headlights You switch on fogs you turn off headlights, fogs go off too. You switch headlights back on and fogs remain off. You go to switch fogs back on and the switch is already in on position but fogs are off.
That cant be a normal rocker surely.
Ill give them a ring, thanks.
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Rich
Club Retro Rides Member
Posts: 6,303
Club RR Member Number: 160
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Sept 14, 2016 12:30:49 GMT
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That looks promising. I don't get why it has a rocker switch and not a momentary though. You switch on headlights You switch on fogs you turn off headlights, fogs go off too. You switch headlights back on and fogs remain off. You go to switch fogs back on and the switch is already in on position but fogs are off. That cant be a normal rocker surely. Ill give them a ring, thanks. It should be controlled by a momentary switch so it's probably a momentary rocker switch they list, I've got some on our diesel buggy for glow plugs.
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Sept 23, 2016 6:17:22 GMT
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This may be what you want... When S2 is closed, push S1 and RY2 clicks on. Push it again and RY2 clicks off. When S2 is open, it resets to off. RY1 can be a cheap, low power type - it's only there to latch RY2 on which handles the O/D solenoid current. RY2 is a 6 pin DPST relay. (If you can't get one, I guess use two ordinary 4 pin relays and wire the coils in parallel.) R1 is a ballast resistor and should be sized so that both relay coils see about 7V when RY2 is latched on and S1 is not pressed (e.g. about 150 ohm, assuming RY1 is small and RY2 a normal automotive relay.) If you don't want the O/D current going through the ignition switch, you can use a separate (fused) feed just for the top contact of RY2. I have something similar for the fan override on my bike. Fan can't be turned on when the key is out but it can still run-on if needed after I've stopped.
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Sept 25, 2016 18:56:05 GMT
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Thanks, looks perfect.
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