Author Topic: Single wire alternator  (Read 3089 times)

Bjv69ss

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Single wire alternator
« on: October 21, 2007, 03:49:54 PM »
Anyone know what I need to do to run a single wire internal regulator alternator in my 69?  Did they all have an external regulator? Thanks
1969 Fathom Green
SS 350 Coupe 
71 Impala Sport Coupe

hotrod68

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Re: Single wire alternator
« Reply #1 on: October 22, 2007, 04:21:10 AM »
It's easy...I put one on my '68 and it works like a charm. You have to do away with the white and blue wires and just run a single 10ga wire from the alternator to the horn relay, then another 10ga wire to the battery or starter solenoid if the battery in is the trunk. You can actually use your existing harness to do it if you study the schematics and make the right splices. The only downside is the generator light on the dash won't work anymore without a special diode wired in. Hope this helps and good luck!
HotRod'68  1968 SS350 coupe undergoing frame-off resto/rod. 386/350/4.11s
Butternut Yellow    black standard interior

JohnZ

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Re: Single wire alternator
« Reply #2 on: October 22, 2007, 03:12:42 PM »
You might want to go to www.madelectrical.com and read about the differences between 1-wire and 3-wire alternator setups before you tear into it.
'69 Z/28
Fathom Green
CRG

68lowered

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Re: Single wire alternator
« Reply #3 on: October 23, 2007, 12:35:45 AM »
I read the articles at www.madelectrical.com before I ordered my engine harness and went with a custom harness that incorporates a three wire internally regulated alternator. Check out their info on headlight relays and splice blocks too.
68 Midnight Blue/White top
Frame off rebuild in progress
327/4sp/3.73

hotrod68

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Re: Single wire alternator
« Reply #4 on: October 23, 2007, 02:47:35 AM »
The 3-wire works as well, but with a true 1-wire alternator it really is that simple. I have had no problems at all on my '68 using the 1-wire setup. Just be sure the 1-wire 7127-type alternator has an internal diode that cuts the output when the switch is turned off, otherwise the engine will continue to run. Any competent starter/alternator shop can build a 1-wire alternator for around $65.
HotRod'68  1968 SS350 coupe undergoing frame-off resto/rod. 386/350/4.11s
Butternut Yellow    black standard interior

Bjv69ss

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Re: Single wire alternator
« Reply #5 on: October 24, 2007, 10:33:39 AM »
Thanks for the help!  I knew you guys would know!  Thanks
1969 Fathom Green
SS 350 Coupe 
71 Impala Sport Coupe