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| Help! Voltage Regulator https://www.ausmini.com/forums/viewtopic.php?f=2&t=68520 |
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| Author: | Mike Montgomery [ Thu Jan 27, 2011 4:54 pm ] |
| Post subject: | Help! Voltage Regulator |
Hey Guys I think I have narrowed my problem to my voltage regulator on the back of the speedo.. I have two wires coming off it and I'm sure there should be three 
I'm trying to upload a picture but my laptop, like my car, is refusing to co-operate. Can someone tell me what should be coming off it? A picture would be fantastic. I JUST WANT TO GO FOR A DRIVE!!!!! 
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| Author: | jb007 [ Thu Jan 27, 2011 6:16 pm ] |
| Post subject: | Re: Help! Voltage Regulator |
Mike Montgomery wrote: Hey Guys
I think I have narrowed my problem to my voltage regulator on the back of the speedo.. I have two wires coming off it and I'm sure there should be three I'm trying to upload a picture but my laptop, like my car, is refusing to co-operate. Can someone tell me what should be coming off it? A picture would be fantastic. I JUST WANT TO GO FOR A DRIVE!!!!! I'm going by memory, so be kind; The case is earth, it has to be connected to a bracket or something in the instrument pod that is earthed. The other two terminals are 'B' and 'I', B is 12V from a switched source, and I is the voltage out to the instrument gauges. I should read 10V using an analogue multimeter. 
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| Author: | drmini in aust [ Thu Jan 27, 2011 6:19 pm ] |
| Post subject: | |
If you find the regulator is toasted (or like mine, dropped voltage with body vibes when driving) PM wombat, he makes an electronic replacement that does not rely on 1950's vibrator technology. It'd be cheaper, too. |
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| Author: | Mike Montgomery [ Thu Jan 27, 2011 6:56 pm ] |
| Post subject: | |
This is mine, whats wrong with it 
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| Author: | Mike Montgomery [ Thu Jan 27, 2011 6:58 pm ] |
| Post subject: | |
there is a misc black wire hanging amongst the gauge wiring that appears to have been cut, it must be missing an earth.. |
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| Author: | DTrain [ Thu Jan 27, 2011 7:01 pm ] |
| Post subject: | |
try that otherwise do what the doc says |
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| Author: | drmini in aust [ Thu Jan 27, 2011 7:08 pm ] |
| Post subject: | |
The black wire goes onto a stud near the top of the speedo. 
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| Author: | superSeven [ Fri Jan 28, 2011 4:20 am ] |
| Post subject: | |
Mike Montgomery wrote: This is mine, whats wrong with it
what are the symptoms? if you cant drive the car, I dont think this is the problem as it only feeds a stabilised voltage to the temp and fuel gauge IIRC. but if the symptom is that your temp or fuel gauge isnt working, then yes, there is a wire missing! it seems you have the green 12V feed going to it, and one out.. you are missing one of the wires which would go to the fuel gauge or temp gauge. the unit is ground via it's attachment to the back of the speedo, which is also grounded. a ground wire DOES NOT connect to any of those pins. (!) cheers |
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| Author: | Molina [ Fri Jan 28, 2011 5:35 pm ] |
| Post subject: | |
I am installing a smiths fuel gauge in my mini that i believe was off an MG or some other car. Is this "voltage regulator" of which you speak required? I had a little unit like that wired up to the standard Morris speedo (with inbuilt fuel gauge)... The friend i have helping me wire up the car doesn't seem to know much about them. |
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| Author: | Hanra [ Fri Jan 28, 2011 11:27 pm ] |
| Post subject: | |
Pretty much all older cars Ive worked on have them. They are usually just a 5v regulator for a few instruments. Like Temp/fuel. Like a LM7805T would do the trick to Id imagine. |
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| Author: | GT mowog [ Sat Jan 29, 2011 6:38 am ] |
| Post subject: | |
Hanra wrote: Pretty much all older cars Ive worked on have them. They are usually just a 5v regulator for a few instruments. Like Temp/fuel.
Like a LM7805T would do the trick to Id imagine. The Mini one's are actually 10V. I use two 7805's, referencing the second one from the output of the first to get yr 10 Volts
Fairly sure that all the Smiths gauges from about the mid 60's on use a regulator of some sort. |
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| Author: | Hanra [ Sat Jan 29, 2011 9:15 am ] |
| Post subject: | |
10v. Cool there ya go. That's my new fact for the day!! |
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| Author: | GT mowog [ Sat Jan 29, 2011 9:31 am ] |
| Post subject: | |
Hanra wrote: 10v. Cool there ya go. That's my new fact for the day!!
I seem to recall that you can actually get LM7810's now. How easy is that! |
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| Author: | Wombat [ Sat Jan 29, 2011 11:11 am ] |
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GT mowog wrote: Hanra wrote: 10v. Cool there ya go. That's my new fact for the day!! I seem to recall that you can actually get LM7810's now. How easy is that! Only one wholesaler has them as far as I know and there is a minimum order - Any 78xx series drifts a bit with varying input voltage unless some smoothing caps are put across input and output. They knock 0.1-0.2 off the output but hold it rock steady. Easier to buy mine 
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| Author: | Mini_Maxx [ Sat Jan 29, 2011 11:36 am ] |
| Post subject: | |
Is the Green/ red wire attached to the reg or are my eyes tricking me, it looks like the terminal with the blue connector has the wire coming from it lopped off and the Green/red wire is heading off elsewhere. I think i look at things too hard |
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