[Vwdiesel] Wiring a VW alt in tandem with another

[lbaird119 at aol.com]

Since the JD alt charges at 15V it's going to be working pretty hard since the VW alts tend to charge in the high 13's to low 14's.  You could use a separate battery for your cab/pto system, even if it's a small motorcycle or lawn tractor battery.  Not sure how well they share the load when regulated at different voltages.  Might be time for Roger to comment!  :-)
     Loren



-----Original Message-----
From: Travis . <tgott at hotmail.com>
To: Loren Vw <lbaird119 at aol.com>; eriklane <eriklane at gmail.com>
Cc: vwdiesel <vwdiesel at vwfans.com>
Sent: Tue, Dec 4, 2012 7:47 am
Subject: RE:Wiring a VW alt in tandem with another


I think I am understanding better then. So I will hook the D+ to the PTO power. The PTO uses an electric magnet to attract the clutch and start the spinning so without power it doesn't spin. I at this point could put the light inbetween just to make sure it is working as the light shouldn't turn on if the line isn't drawing power from either side even though it will be connected off the PTO line which will use power. Then I will hook the B+ straight to the battery and then the power from the cab hook to the battery as well. And also run the cab in parrallel with the tractors alternator and battery? Would that hurt anything. Having both PTO's on the tractor-it won't allow for much charging of the battery which is why I want them in parrallel. At the same time-I don't want to fry the expensive Voltage regulator on the tractor, the VW alt and the two batteries. The tractor alt tends to like to charge right at 15 volts which is common on the JD 332. Keep the comments coming. I figure it can work on this forum since it is a VW battery and alternator and the JD tractor is diesel-and my rabbits are parked for salt season. 
 
Travis 
 


To: tgott at hotmail.com; eriklane at gmail.com
Subject: Re: [Vwdiesel] Wiring a VW alt in tandem with another
From: lbaird119 at aol.com
CC: vwdiesel at vwfans.com
Date: Tue, 4 Dec 2012 02:10:32 -0500


  Sounds like you could.  The field needs a little power to excite it until it starts turning and becomes self excited (that's what the bulb's for).  It only needs power when it starts running and yes, as you surmised, once it starts generating, the light goes out because it's not using power (nor sending any back through that D+ wire).
  Thus the D+ wire will need to go to switched power and the B+ to the battery.  You must have a battery to an alt.  Not sure if it's to smooth out the AC ripple like with an inverter or if it's to make the regulator work properly but I've always been told "you'll burn up an alt without a battery, unlike a generator".
     Loren



-----Original Message-----
From: Travis . <tgott at hotmail.com>
To: eriklane <eriklane at gmail.com>
Cc: vwdiesel <vwdiesel at vwfans.com>
Sent: Mon, Dec 3, 2012 9:11 pm
Subject: Re: [Vwdiesel] Wiring a VW alt in tandem with another



o if the light is on-then the alt either isn't working or isn't spinning but if 
he light goes off the wire that does the exciting no longer draws electricity 
nd the light goes out? The VW alt will be running from the rear PTO which is 
an through a separate switched power source to turn the PTO on. Could I just 
ap into that as the alt wouldn't be turning unless the PTO is also energized?
Travis
> Date: Mon, 3 Dec 2012 20:44:39 -0800
 Subject: Re: [Vwdiesel] Wiring a VW alt in tandem with another
 From: eriklane at gmail.com
 To: tgott at hotmail.com
 CC: vwdiesel at vwfans.com
 
 At least have the wire go through a little automotive light bulb. This
 works as an 'idiot light' to tell you when it's working properly, and
 also limits the current to the field while you're first starting up.
 It's nice to keep it down some until the regulator has taken over and
 is controlling the power output from the alternator. I would just hook
 it up to the key switch so it was on whenever the engine was on, just
 like how it's wired in a car. Dead simple, and it does a great job.
 
 Erik
 
 On Mon, Dec 3, 2012 at 8:37 PM, Travis . <tgott at hotmail.com> wrote:
 >
 > I almost have my JD L&G tractor wired up to run my VW alternator off the 
ear PTO (front PTO drives the snow blower). My question is on the exciter 
ire-does it need to have a diode on it or can it just be a switched power 
ource that can be turned on and left on while running, or should it be a 
omentary switch to excite it and then turn off? I am pretty sure the rest 
hould be easy just having the two alternators and batteries in parallel. The 
ractor alt has just enough power to run the PTO's and other functions to keep 
he tractor running so the VW alt is for the addition of the cab and its 
unctions (wiper, heater, fan, lights, etc). I will have another battery in a 
allast box behind the tractor (go figure-a vw rabbit battery).
 >
 > So-diode, momentary switch or just on/off switch for the the exciter wire.
 >
 > Travis
 >
 >
 >
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