harris66
Part of things
drive it, break it, fix it and make it quicker!
Posts: 699
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Jun 16, 2010 16:01:51 GMT
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we are fitting an alternator to our a40 drag car, help run the fan, ignition etc, we using a typical 70s,80s lucas unit.
it has 3 spade connectors on the rear, 1 is a standard type size, the 2 others larger, i think i know how to wire it but want to hear anyone elses info, experience of wiring these from scratch, thanks in advance ;D
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1.2 corsa daily, 1.8t a4 avante, 6.3ltr austin a40....
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Jun 16, 2010 16:07:12 GMT
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small one goes to the ignition light, the two big ones are for the battery, only reason theres two is to save on having to use a single really heavy gauge cable.
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Volvo back as my main squeeze, more boost and some interior goodies on the way.
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harris66
Part of things
drive it, break it, fix it and make it quicker!
Posts: 699
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Jun 16, 2010 17:02:06 GMT
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ok as i thought, we wont be using an ignition light so can the smaller one just be let unconnected to anything? and is it as simple as running two cables from the lager ones to a battery source?
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1.2 corsa daily, 1.8t a4 avante, 6.3ltr austin a40....
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Jun 16, 2010 17:09:25 GMT
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^^What about the wiring to the VR?
....or does it have a built-in style VR?
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Last Edit: Jun 16, 2010 17:10:40 GMT by Team Blitz
 Team Blitz Ford Capri parts worldwide: Restoration, Road, or Race. Used, Repro, and NOS, ranging from scabby to perfect. Itching your Capri jones since 1979! Buy, sell, trade. www.teamblitz.com blitz@teamblitz.com |
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Jun 16, 2010 17:10:44 GMT
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What Topup poster said. Yes, the two big terminals go direct to the battery. You have to have an ignition light on it unfortunately, otherwise it won't switch on. Just use a small dash light or indicator warning light. You might get away with a small resistor instead. TB, the regulator is built in  |
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Last Edit: Jun 16, 2010 17:11:54 GMT by Deleted
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Jun 16, 2010 17:27:06 GMT
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Two big terminals to the battery (use either, they are connected together inside) and the other needs to be connected through some sort of resistor/bulb to an ignition switched 12v feed to excite the field windings. Otherwise the alternator will either not charge at all/just barely charge. It has to be switched or you'll slowly drain the battery through it!
From memory, I used a ~100ohm resistor connected to the 12v ignition feed on the coil on my mini (Bloke who fitted a digi dash before left it unconnected and the jolly pain in the backside didn't charge!) This worked fine.
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Last Edit: Jun 16, 2010 17:29:54 GMT by cobblers
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harris66
Part of things
drive it, break it, fix it and make it quicker!
Posts: 699
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Jun 16, 2010 18:01:26 GMT
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ah ok thanks for the advice, and all makes sense, just 1 more, as its a boot mounted battery, can the charging wire from the alternator go to the main battery cable that bolts to the starter, as oposed to running a cable the lenght of the car?
many thanks again chaps
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1.2 corsa daily, 1.8t a4 avante, 6.3ltr austin a40....
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Jun 16, 2010 18:03:24 GMT
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can the charging wire from the alternator go to the main battery cable that bolts to the starter, as oposed to running a cable the lenght of the car? Yes, that's fine (and would probably work better anyway) |
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Last Edit: Jun 16, 2010 18:04:07 GMT by cobblers
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harris66
Part of things
drive it, break it, fix it and make it quicker!
Posts: 699
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Jun 16, 2010 19:48:18 GMT
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top advice guys, thats why i love this site ;D
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1.2 corsa daily, 1.8t a4 avante, 6.3ltr austin a40....
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