3.0 Pertronixs Wiring, Bypassing Resistor

[bebecker]

I have the Petronix II and the Flamethrower II coil for installation in my 89 3.0 alpha leg.<br /><br />The instructions suggest bypassing the resistor wire because the coil has internal resistanc. Both the coil and the conversion are designed to handle 12v.<br /><br />Where have people been getting power from and what have people been removing?<br /><br />Any thoughts suggestions would be appreciated. And, yes I have searched the archives.<br /><br />thanks

 

[fendersfender]

Re: 3.0 Pertronixs Wiring, Bypassing Resistor

Get a manual and check wiring diagram. You should be able to locate an ignition powered hot wire.........if not, you can always run a lead from the ignition switch.

 

[Bsturkie]

Re: 3.0 Pertronixs Wiring, Bypassing Resistor

Remove your old pointset and condenser. If you need to bypass the resistor, then the red wire goes to the positive side of the coil, and the black wire goes to the negative side of the coil. Make sure the wires in the distributer DO NOT get in the way of the rotor or you will have quite a mess. You must reset timing after the install. <br /><br />Just the bit that I know.

 

[dk6164]

Re: 3.0 Pertronixs Wiring, Bypassing Resistor

I had the same question when installing my Petronix II kit. I have a 12v. AND a resistor wire going to the positive side of the coil. I'm not sure if I need to remove the resistor wire or not! I have the Flamethrower coil also and it seems to run OK with both of the wires connected. Of course, I haven't gotten her wet yet. Hopefully today!!!!

 

[KaGee]

Re: 3.0 Pertronixs Wiring, Bypassing Resistor

You should be able to get 12volts from your start assist solenoid. A wiring diagram is avaialable with a manual. As stated... get a manual for your engine setup.<br /><br />Tape up the resistor wire so you don't get a short.

 

[bebecker]

Re: 3.0 Pertronixs Wiring, Bypassing Resistor

Does the starter assist provide a constant 12v or just a boost when cranking?<br /><br />Thanks

 

[ron7000]

Re: 3.0 Pertronixs Wiring, Bypassing Resistor

the way the ignition is wired in a points system is wire from battery first goes to your igntion switch. When ign switch is turned to run (engine running) full 12-14v power runs from the ign side of the switch to the engine where it connects to either a ballast resistor or to a resistor wire. Then this wire connects to the + side of coil, and this resistance drops the voltage down around 9v (when engine running) to prolong the life of the points.<br />For the start assist, when you turn ign key to start (engine NOT running) full 12v battery power goes to starter solenoid to activate the starter, but from the solenoid this 12v power paralles off and goes to the + side of coil, your 2nd wire on the coil + side. This is the only time the coil should see 12v, when starting the engine. When you release the key from start to run, coil no longer sees 12v power because it now comes thru the resistance as described.<br /><br />with the pertronix with flamethrower coil install:<br />remove the 2nd wire on + side of coil coming from the starting side of the ignition key switch, you don't need it.<br />Trace back from + side of coil to either resistance wire or balast resistor then to ignition key switch run side. All you do is take the resistance out of the ciruit, so the wiring simply goes from ignition switch run side to the + side of coil.

 

[dk6164]

Re: 3.0 Pertronixs Wiring, Bypassing Resistor

ron7000-Now that's a clear answer. Thanks for the response!

 

[rodbolt]

Re: 3.0 Pertronixs Wiring, Bypassing Resistor

clear but not quite accurate for the petroniox .<br /> first off have you tested the coil current draw as per the instructions?<br /> if you have and your coil current draw is within specs then leave the resistor wire attached to the +post. remember the petronix is only an electronic switch. on the 3.0 with electric choke I normally tap the 12V +feed for the petronix off the choke circuit.<br /> now the "switch" is in parellel with the ign coil. the coil operates at the correct current and does not overheat and the "electronic" switch is operating at its 12V.<br /> the instructions are not real clear but you can picture the resistance wire as a ballast resistor that is 2ft long as opposed to a square block, both do the same function.<br /> if you use the resistance wire to power up the ignitor the system gets erratic, if you feed 12V to an extrnal resistance type coil the coil gets hot and problems may occur.<br /> thats why I leave the resistor in place and take the ignitor tap off either the choke, if the choke circuit can supply it, or tap off the purple wire at the altenator, if it has it.<br /> or you can trace the resistor wire back and tap into the purple wire just befor the junction of the resistor wire.<br /> this aint rocket science but the petronix instructions are lacking for the do it your selfer sometimes.<br /> most do it yourselfers have no clue how or why or even what voltages may be encountered on either the primary or secondary sides of the ign coil.<br /> and leave the 12V from the starter R terminal.<br /> you may find there is not enough coil primary circuit voltage at cranking without it.<br /> the R stands for resistor bypass circuit.<br /> I personally dont care for petronix, however I fix a lot of them and install them if I cannot talk the customer into a better system or just maintaning theirs.<br /> most folks that messed up the install have glazed eyes when it comes to checking the original coil as per the instructions to see if the current draw is within limits of the petronix ignitor.

 

[KaGee]

Re: 3.0 Pertronixs Wiring, Bypassing Resistor

Rod, Becker bought the Flamethrower coil which is 3 ohm and requires 12 volt.

 

[rodbolt]

Re: 3.0 Pertronixs Wiring, Bypassing Resistor

but did he follow the instructions on max current draw fow the 4cyl motor ?<br /> thats what I kept asking.<br /> the current path is now through the coil primary and through the ignitor, used to be through the primaries and the points to ground.<br /> the instructions that came with the petronix must be followed or it wont work right.<br /> I think the current draw for the 4cyl is about 4 amps but the instructions tell you how to actually check it.