Alternator Options

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Alternator Options

Postby 78dtv » 29 Jan 2008, 10:21

Can anybody give me some idea of alternative alternators which will bolt straight on (or bolt on with minimal engineering work).

Looking at it for the 1256 I have just bought and for Roy's and need options as once I get some spots on it it will be pushing 38Amps on spots and headlights alone but the alternator on it is 35Amps. Roy obviously has the same problem with his.
Last edited by 78dtv on 29 Jan 2008, 12:06, edited 1 time in total.
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Postby Shellysowner » 29 Jan 2008, 10:51

Later alternators were 45 amps, so I'd say the easiest solution is to use one of those. In fact I even have a spare one in decent condition that I can sell you - I could send it along with the wheels.
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Postby Gordo » 29 Jan 2008, 11:17

If you're prepared to do a little fabrication work, you've a few options - I used a Bosche 55A/80A alternator setup. The models I used were 2 wire ones - I would suggest making up either a nylon or heavy steel adjustment brace as I had a lot of trouble with vibration/fatigue cracking, until I used some 3/8" bar.
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Postby 78dtv » 29 Jan 2008, 13:54

I'll have to do some sums on the 45amp ones Ralph. Spots alone equate to an extra 21 amps. Roy's seems to cope with the 100watt bulbs in main beam but not really sure whether the extra 10amp would accomodate the spots or not.

Gordo's Bosch example seems plausible, I have mountains of Ford 75 and 90 amp alternators so will see if I can squeeze one of those on. Was mainly hoping someone might know a straight swap from another car.
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Postby 78dtv » 29 Jan 2008, 13:54

P.S. Edited the title so Alternator is spelt correctly :oops:
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Postby Gordo » 30 Jan 2008, 07:37

What wattage bulbs are you using?
55W at nominal 13.2V is approximately 4A
100W at nominal 13.2V is approximately 8A.
An alternative is to use butty wiring and individual relays for each headlight filament, not forgetting the earth. I was using 100/80W headlight bulbs and had 14.4V at the lights - very bright - I'd also fitted Super Oscars with 100W bulbs, also at 14.4V, hence the change to an 80A alt'. I should mention the dip circuit was switched directly from the headlight switch and was permanently on, the 'dip switch' was only used to turn the high beam on and off.
I used a hybrid feed to the relays, the alt' had cables to the battery AND relay, the relay also had a cable feeding from the battery.

I would get flashed from over 5km distance! Probably because I had 80+80+100+100+100+100=560W of overdriven lighting :twisted:

Overall, I would stick to the headlights with the relays and 100/80W bulbs
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