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Another damn electrical related topic
https://www.ausmini.com/forums/viewtopic.php?f=2&t=38448		 Page 1 of 1
Author:  Harley [ Tue Dec 04, 2007 10:04 pm ]
Post subject:  Another damn electrical related topic
Firstly, thanks for popping in, cause these topics are quite frequent I know.

I have this possible issue with my 1100 engine where it looses approximately 400 rpm when I turn the headlights on, to the point where the car sounds like it will stall if left to go longer than 10 seconds.

I replaced the alternator with another exactly the same, but the results were also replicated.

Anyway, If anybody would like to throw ideas into the arena for me to have a gander at
or tell me what I should be making my car idle at all would be appreciated.
Thanks.

:D
Author:  Hanra [ Tue Dec 04, 2007 10:11 pm ]
Post subject: 
400rpm.... Geez thats a lot.

How bright are your lights when u have them on?

Obviously when you have your lights on, your electrical system draws more current, which the alternator has to supply. This loads up the alternator which in turn loads up the motor to due magnetic flux.
Author:  Harley [ Tue Dec 04, 2007 10:16 pm ]
Post subject: 
The lights are stock rover ones (at low beam), as is the alternator.
Author:  Hanra [ Tue Dec 04, 2007 10:23 pm ]
Post subject: 
Is your car a Rover?

Are they the correct wattage bulbs fitted?

Did this fault just occur out of the blue?
Author:  Harley [ Tue Dec 04, 2007 10:26 pm ]
Post subject: 
Car is a rover, electrical system is as it left the factory.
Difference is I've just fitted ab 1100 engine to it.
The car's state of tune appears to be okay, however may need the timing adjusted
by a poofteenth of a degree, if that'll help?
Author:  Hanra [ Tue Dec 04, 2007 10:31 pm ]
Post subject: 
Hmm ok... Cant say i know anything about the Rovers wiring system or engine management (if applicable)

Either way 400rpm is a huge drop...
Author:  Moke'n'Andy [ Wed Dec 05, 2007 5:04 am ]
Post subject: 
Hi,

What condition is your battery in? Try fully charging it and then do the same test.

Has the pulley size changed on the alternator?

What wattage are the globes?
What output is the alternator?
If you pick up the revs to say 1200 are the lights nice and bright?

just some ideas and things to look at.
Author:  Mike_Byron [ Wed Dec 05, 2007 9:47 am ]
Post subject: 
Check a couple of connections and make sure they are metal to metal and not metal to paint or metal to rust and corrosion.

They are ;
The negative cable from the battery in the boot.
The earth strap from the gearbox to the body
The power feed on the solenoid.

Give each a quick hit with some emery paper and check to see if the problem still exists.

Mike
Author:  mad-mk1 [ Wed Dec 05, 2007 9:52 am ]
Post subject: 
my deluxe did exactly the same thing,

i just checked all earths and cleaned up connections.
Author:  Harley [ Wed Dec 05, 2007 10:01 am ]
Post subject: 
I'll check all of them later tonight.
Whilst I'm at it, if I put a little copper grease between metal to metal connections, (with intention of reducing rust/corrosion) will that help or would it be an insulator?
I know copper has good electrical properties, but don't know what else is in the grease.
:D
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