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voltage drop
https://ausmini.com/forums/viewtopic.php?f=2&t=95226		 Page 1 of 2
Author:  meehal [ Sat Apr 15, 2017 6:13 pm ]
Post subject:  voltage drop
Hi all,

I'm working on my 850 and i noticed that i appear to have a pretty bad voltage drop, at the battery it reads 12.5v, at the coil it reads 10.5v, i found this out while testing the fuel sender in the boot, its reading 9.5v.

I've gone around and cleaned up misc contacts but it hasn't made any difference.

I do have a dodgy ground cable at the battery that i need to replace, but at the engine side where it comes in (not sure what its connected to) it reads 12.2v which is okish?

Is there something common that could be causing this?

thanks
Author:  Mick [ Sat Apr 15, 2017 7:11 pm ]
Post subject:  Re: voltage drop
Is this while the car is running or at stop?

There are choke points for current which will cause a voltage drop if the contacts are dirty or damaged. The two I would look at for an ignition run is the fuse box, and the ignition switch. Both are a little fragile with age and can cause some drop.
Author:  meehal [ Sat Apr 15, 2017 11:22 pm ]
Post subject:  Re: voltage drop
This is just when its stopped, i found out when i was doing the electric fuel pump.

Thanks mick, i'll check it out tomorrow. I didn't even think to check the fuse box!
Author:  timmy201 [ Sun Apr 16, 2017 11:36 am ]
Post subject:  Re: voltage drop
Mick is back! In the country for long this time?
Author:  Goldbrocade_62 [ Sun Apr 16, 2017 1:06 pm ]
Post subject:  Re: voltage drop
timmy201 wrote:
Mick is back! In the country for long this time?

Depends if they grant him Australian citizenship 8) :lol:
Author:  DavidE [ Sun Apr 16, 2017 1:58 pm ]
Post subject:  Re: voltage drop
meehal wrote:
Hi all,

I'm working on my 850 and i noticed that i appear to have a pretty bad voltage drop, at the battery it reads 12.5v, at the coil it reads 10.5v, i found this out while testing the fuel sender in the boot, its reading 9.5v.

I've gone around and cleaned up misc contacts but it hasn't made any difference.

I do have a dodgy ground cable at the battery that i need to replace, but at the engine side where it comes in (not sure what its connected to) it reads 12.2v which is okish?

Is there something common that could be causing this?

thanks


I hope you're not expecting to find 12v at the fuel sender. It runs off 10v.
Author:  gtogreen1969 [ Sun Apr 16, 2017 2:08 pm ]
Post subject:  Re: voltage drop
DavidE wrote:
meehal wrote:
Hi all,

I'm working on my 850 and i noticed that i appear to have a pretty bad voltage drop, at the battery it reads 12.5v, at the coil it reads 10.5v, i found this out while testing the fuel sender in the boot, its reading 9.5v.

I've gone around and cleaned up misc contacts but it hasn't made any difference.

I do have a dodgy ground cable at the battery that i need to replace, but at the engine side where it comes in (not sure what its connected to) it reads 12.2v which is okish?

Is there something common that could be causing this?

thanks


I hope you're not expecting to find 12v at the fuel sender. It runs off 10v.

Don't early 850's run 12v ?
Author:  DavidE [ Sun Apr 16, 2017 3:14 pm ]
Post subject:  Re: voltage drop
gtogreen1969 wrote:
[
Don't early 850's run 12v ?


Not according to Convertible Mini's treatise in Fuel senders for Dummies on this forum.
Author:  Goldbrocade_62 [ Sun Apr 16, 2017 4:42 pm ]
Post subject:  Re: voltage drop
I thought early 850s coopers had no stabiliser so they had 12 volts and for example the fuel gauge went straight up straight up to the level not slowly up to it
Author:  meehal [ Mon Apr 17, 2017 8:30 am ]
Post subject:  Re: voltage drop
i didn't realize there was 10v in minis, is there anyway to confirm it should be 10 or 12v?
Author:  DavidE [ Mon Apr 17, 2017 10:04 am ]
Post subject:  Re: voltage drop
meehal wrote:
i didn't realize there was 10v in minis, is there anyway to confirm it should be 10 or 12v?


You should have a voltage stabiliser/regulator affixed to a strap at the rear of the speedo. It's a small tin box with a fibre lid and a number of 14" terminals poking out (or have wires connected to them. That box turns 12v input into 10v output for the instruments (like (and in particular the fuel gauge and fuel sender). Search for the thread Fuels Senders for Dummies and in particular the postings by Convertible Mini.
Author:  timmy201 [ Mon Apr 17, 2017 12:09 pm ]
Post subject:  Re: voltage drop
850's or Coopers didn't come fitted with a voltage regulator (for the fuel gauge etc) until 1964 in the UK. I can't see it being any earlier here.. My 1964 850 doesn't have one

Fuel gauge info
http://www.somerfordmini.co.uk/eshop/in ... page&id=83
Fuel sender info
http://www.somerfordmini.co.uk/eshop/in ... age&id=161
Author:  winabbey [ Mon Apr 17, 2017 12:14 pm ]
Post subject:  Re: voltage drop
Wombat's part utilises later technology to good effect, but in case you are after originality there are still NOS of the stabiliser.

http://minikingdomonline.com.au/product ... condition/
Author:  DavidE [ Mon Apr 17, 2017 12:28 pm ]
Post subject:  Re: voltage drop
winabbey wrote:
Wombat's part utilises later technology to good effect, but in case you are after originality there are still NOS of the stabiliser.

http://minikingdomonline.com.au/product ... condition/


I wanted originality so I have modified both of my devices by inserting an IC into the casing and sealing it all up again. The only tell-tale is an earth screw into the side of the casing. Best of both worlds.
Author:  winabbey [ Mon Apr 17, 2017 12:39 pm ]
Post subject:  Re: voltage drop
DavidE wrote:
The only tell-tale is an earth screw into the side of the casing.

The judges at your next concours event will pick that up for sure. There goes 10 points for lack of originality. :P
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