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Location:
Canberra
Registered:
February 2004
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18r alternator conversion
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Mon, 15 August 2005 12:43
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HI guys,
I've got a bosch 60a internally regulated alternator from a scrapyard and mofified it to fit into my 18rc. The guy reckoned that it was from a Ford Fairmont. I had to have 2 mm taken off the pulley spacer and change the bottom and top mounts to make it fit, I also used a pulley of a ke70 corolla. I was back down the scrap yard the other day and found a 22re alternator. I couldn't compare it to the 18r but it looks real close. Could this be a much simpler exchange? Anybody done it? Thanks guys.
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Location:
Canberra
Registered:
February 2004
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Re: 18r alternator conversion
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Thu, 18 August 2005 08:57
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No takers on this one aahhh well. Ok then another question. On the fairmont alternator ther is only one wire excluding the battery wire, it is used to excite the alternator initially and then causes the charging light to go out. On the toyota three wire alternator what exact function does the permanent live fulfill? Thats not the charging wire but the permenant feed into teh alternator? Thanks guys.
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Location:
Brisbane
Registered:
February 2003
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Re: 18r alternator conversion
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Thu, 18 August 2005 12:21
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from memory, an internal regulated alternator needs:
charge-light wire (yellow wire coming from fuse box to alt in an RA40)
batt+ (big white wire connects to big-arse terminal)
ign+ (black-yellow wire, get's power when key is at ign position)
without the bottom two the charge light wont go out
permanent power is to charge the battery or drive the electrical system when you foolishly remove the battery while the car is running
so the ing+ is probably to excite the alt, when runnin the built-in regulator then provides the 12V bias to extinguish the alt light.
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Location:
Canberra
Registered:
February 2004
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Re: 18r alternator conversion
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Thu, 18 August 2005 12:46
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You can always rely on the Chuckster for a decent answer!
Believe it or not you can actually run one of these alternators in your car with only the battery wire connected. The alternator will self excite if it has decent magnets and start charging when you get above 1000 revs and keep on going from there. I dont know if this would be bad for the diodes or diode pack so i've actually ran a feed from the black/yellow with a bulb in line to excite it. My charging light is on constantly now but I can monitor the battery voltage with the voltmeter. Interestignly enough if you remove the bulb form the charging light the automatic choke stops working as its connected to the charging light relay.
I've upgraded the battery chargign cable to 110 amp stuff from jaycar. Its made a good difference when you load up the charging system. Think of how many people you know that have spent big bucks on their amps and amp wire and left the original crappy charging wire on the alternator. I converted it because my collection of 18r alternators were all pretty much knackered and I got the ford internally regulated one for 45 bucks and it was nearly new. Works good.
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Location:
Brisbane
Registered:
February 2003
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Re: 18r alternator conversion
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Thu, 18 August 2005 12:56
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thanks maurice - a vote of confidence 
fwiw, i ended up putting a 100A bosch alternator in from a stationary genset (not the main alt, but the thing to keep starting battery topped up). the thing needed a few rpm to kill the charge light so i probably didn't hookup the right cable to the ign plug.
had to modify the mount bracket to suit the alt case, but it never ran out of voltage regardless of how many fans or lights were running
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