| [ Total Views: 1112 | Total Replies: 12 | Thread Id: 41900 ] |
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 72FASTY
Commited Dubber
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| posted on July 19th, 2005 at 12:08 PM |
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Ignition Coil - Resistor
Anyone ever wired up an ignition coil resistor before?
I got told i needed one and after asking the local auto shop guy how to do it, the car doesnt even start. I have wired one side to the + terminal and
the other to the -'ve of the coil. Is this wrong?
I can do skids.
In the Wet.
On Oily surfaces.
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Purple Martin
A.k.a.: Martin
Fahrvergnugen
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| posted on July 19th, 2005 at 12:17 PM |
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The wiring diagram for a 72 fasty doesn't show a resistor. Why do you think you need one?
http://www.thesamba.com/vw/archives/info/wiringt3.php
1959 red & white Beetle
1975 Kombi camper
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72FASTY
Commited Dubber
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| posted on July 19th, 2005 at 01:20 PM |
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well i bought a new coil for it, a GT40. Apparently they put out 11v when the engine's ignigiton system is only designed for 9v or something along
those lines. It was recommended i put one in by my mech.
I can do skids.
In the Wet.
On Oily surfaces.
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Purple Martin
A.k.a.: Martin
Fahrvergnugen
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| posted on July 19th, 2005 at 02:12 PM |
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Well coils put out many thousands of volts so I'm not sure what they meant. Does anyone know more about this?
1959 red & white Beetle
1975 Kombi camper
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fetid_swamp
Seriously Crusin Dubber
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| posted on July 19th, 2005 at 05:22 PM |
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i got little bits of advice from here and there when i put my electronic points kit in. i had a gt40 and some people sead i needed a resistor and
some not.
in the end not wanting to stuff anything up, i checked what was on a freinds bug and copied it. su12 coil and accufire setup. no resistor.
now i have the existing gt40 and points and condenser in the spares kit.
i dont think this has helped you though...:jesus
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Old Dubber
Wolfsburg Wizard
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| posted on July 19th, 2005 at 05:44 PM |
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72fasty
If you have a resister type coil - check on bottom of coil, it will have words "Use with resister"
then you will need a resister to go with it - usually a white porcelain block about half the size of a matchbox.
The positive (ignition power) goes to one side of the resister with the other side of the resister to the positive on the coil. This supplies the
11volts or sometimes 9volts to the coil.
You must remember to take the power for the choke and idle solenoid from the input side of the resister ie 12volts, not from the coil (which will only
be 11or 9volts).
If you want to get fancy (like in modern cars) then you can run a wire (which must include a diode) from the starting circuit to the positive side of
the coil. This will give 12volts when cranking to the 9/11volt coil. Gives it that extra boost to compensate for the "drain" the starter motor is
taking from the battery.
Works a treat - and yes I have this setup!
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72FASTY
Commited Dubber
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| posted on July 19th, 2005 at 10:02 PM |
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Thanks old dubber. You raise an interesting point about the choke/idle which i hadnt though off. Basically from the research ive done, the resistor
is used to save burning out the points and thus replacing them frequently from using the new slightly overpowered(?) coils. (forgive my electronic
ignorance)
I have it installed and all is working fine now, although ill have to change that choke/idle wire to the input side of the resistor!
I guess its a $10 investment to be safe, rather than sorry every few hundred miles....
I can do skids.
In the Wet.
On Oily surfaces.
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tassupervee
A.k.a.: Knob Jockey
Custom Title Time!
That really hurts doesnt it!
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| posted on July 20th, 2005 at 07:14 PM |
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Old dubber is quite correct about the ballast resistor and where it goes.
Check out your starter motor as many starters have an auxiliary terminal just for the purpose of supplying a switched 12 feed to the coil side of
ballast resistors.
If you simply run a wire from your pull-in lead on the starter motor, the starter will continue to stay engaged while ever the ignition switch is on!
Hence the diode in the wire to prevent the coil power from backfeeding the starter solenoid.
You can also employ a simple relay, pulled in by the starter wire for the purpose of supplying 12V direct to the coil for reliable starting without
the drama of holding the starter on with ignition.
This setup is the primary reason for using a ballasted system.
L8tr
E
Im not a complete idiot, quite a few parts are missing....
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toplessbug
Fahrvergnugen
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| posted on July 21st, 2005 at 07:39 AM |
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relays are are better option as there is no foward conduction loss thru the diode. ,reverse polarity applied to a diode will result in infinate
impedance(not really but near enough for our purpose) but foward polarity results in .6v across the junction of the wafers inside the device.the idea
of putting a ballast coil in the first place is to get maximum voltage to the coil for starting purposes |
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General_Failure
A.k.a.: Tristan
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Use your head, don't abuse it!
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| posted on July 21st, 2005 at 01:08 PM |
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I think this question is on topic. What's the difference between the GT40 and the GT40R?
Does it mean one of them needs a resistor or has one built in or something? I've never understood.
If at first you don't succeed. Build, build again.
Vehicle: 1975 Special order delivery walkthrough panel based LCA pop-top camper. Motor: Nippon 1.8L Single port Wasserboxer, Transmission: 3 rib 002.
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Purple Martin
A.k.a.: Martin
Fahrvergnugen
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| posted on July 21st, 2005 at 01:21 PM |
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Dunno, but here is an interesting article about Bosch Blue Coils. It describes how to tell if a resistor is built in by measuring the resistance of
the primary coil:
http://www.ratwell.com/technical/BlueCoil.html
1959 red & white Beetle
1975 Kombi camper
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toplessbug
Fahrvergnugen
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| posted on July 21st, 2005 at 01:59 PM |
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gt40 is a 12 volt coil and the r signifies that it must be used with a ballast resistor |
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General_Failure
A.k.a.: Tristan
Custom Title Time!
Use your head, don't abuse it!
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| posted on July 21st, 2005 at 02:11 PM |
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Thanks for that topless. You have solved a long standing mystery for me.
If at first you don't succeed. Build, build again.
Vehicle: 1975 Special order delivery walkthrough panel based LCA pop-top camper. Motor: Nippon 1.8L Single port Wasserboxer, Transmission: 3 rib 002.
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