Alternator rating

Batteries, Alternator, Wiring, Lighting, etc. (Please discuss ignition problems in the Engine category)
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peewee21
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Alternator rating

#1 Post by peewee21 » Wed Jan 13, 2016 8:05 pm

Hi All,

Following on from a FB posting about my Halogen conversion, i was wondering what rating of alternator people use?

for info i have added the halogens X 4 that are rated at 130% above normal halogens, but clame same power rating
still to add would be the phone charger, radio and sat navs etc

cheers
Ian Peacock
still sane? definitely not!!
Mk1 2000 Estate Wedgwood Blue

Mike Stevens
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Re: Alternator rating

#2 Post by Mike Stevens » Thu Jan 14, 2016 12:53 pm

To be honest, compared to the headlamps, things like satnavs, phone chargers etc. draw peanuts in power!

The standard 15/16/17ACR were rated at 25-35A output. 4 headlamps draw about 16A and then if you add rear screen heater, blower motor (fuel pump if a PI!), you are getting well above 25A.

In my PI I have an uprated alternator (it was already fitted when I bought the car). I can't remember the rating, but it is in excess of 45A. That does seem to cope OK.

It is also worth looking at the wiring from the alternator. If you have 2 thick brown wires, then that's the later type and is probably OK. If you have 1 thick and 1 thin, then that was designed for a battery sensed alternator but the modern replacements are machine sensed and so it is well worth fitting extra wires between the alternator and the battery. Also don't forget the negative connections too. If the alternator is giving 30A, then this current flows through the positive wiring to the load and then back through the engine and alternator casing. I have also fitted a negative wire from the battery negative terminal to the alternator body.

Cheers,
Mike.
(South Oxfordshire)
Register Member No 0355
1971 2.5PI Saloon Sapphire blue
1973 2.5PI Saloon rust some Honeysuckle
1973 Stag French blue
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Andy Thompson
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Re: Alternator rating

#3 Post by Andy Thompson » Sat Jan 16, 2016 12:52 pm

Perth WA
1970 2500PI estate
1964 2.7PI saloon
1973 2100 EFI Megasquirt
1972 Stag

http://triumphwestoz.blogspot.com/

Very Big garage

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david_rachel
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Re: Alternator rating

#4 Post by david_rachel » Sat Jan 16, 2016 9:43 pm

Andy Thompson wrote:http://www.ebay.co.uk/itm/Land-Rover-Di ... 1519176022

This sort of thing is perfect
Agreed. I have the same on my car.
David Rachel

1972 Triumph 2.5 PI Estate Royal Blue
1968 MG 1300 Saloon Connaught Green
1978 Carlight Casetta Caravan
http://carlightrestoration.blogspot.co.uk
1995 Lada Riva 1.5 Estate Cherry

tony
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Re: Alternator rating

#5 Post by tony » Sun Jan 17, 2016 7:12 am

Andy,
I liked that too, until I saw the $88 postage cost to NZ. :shock:
Tony.
1976 2500 TC. converted to S specs.

Lots of bits

1999 BMW Z3.
2006 BMW 325ti.
Hopefully not needing too many bits.
1998 Rover 600



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peewee21
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Re: Alternator rating

#6 Post by peewee21 » Sun Jan 17, 2016 7:23 am

cheers, i can not quite make out if is has a built in regulator or not? as you have them would you be able to shed any light on it?

Ian
Ian Peacock
still sane? definitely not!!
Mk1 2000 Estate Wedgwood Blue

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Andy Thompson
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Re: Alternator rating

#7 Post by Andy Thompson » Thu Jan 21, 2016 12:26 pm

tony wrote:Andy,
I liked that too, until I saw the $88 postage cost to NZ. :shock:
Tony.
Surely the same sort of thing is available in NZ - very common alternator on Land Rovers and Jags
Perth WA
1970 2500PI estate
1964 2.7PI saloon
1973 2100 EFI Megasquirt
1972 Stag

http://triumphwestoz.blogspot.com/

Very Big garage

tony
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Re: Alternator rating

#8 Post by tony » Thu Jan 21, 2016 7:05 pm

You're probably right, haven't really looked :oops:
Tony.
1976 2500 TC. converted to S specs.

Lots of bits

1999 BMW Z3.
2006 BMW 325ti.
Hopefully not needing too many bits.
1998 Rover 600



.

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