Needed: Coil resistor wire

4114 Views 21 Replies 10 Participants Last post by David McCollam, Nov 9, 2005

Bo Mows

Discussion Starter · Oct 12, 2005

Has anyone got the resistor wire that goes from the + side of coil to the terminal of the fuse panel. Mine is straight wired now. I've been told this ain't good.

Thanks

Bo

1 - 20 of 22 Posts

jlthunder

· #2 · Oct 12, 2005

sombody will correct me if I'm wrong, but you can use a straight 12 volts on a flamethrower coil. This is usually hooked up to a pertronix ignition system. They are available from bugstuff. Here is a link to their information

http://www.opelgt.com/forums/showthread.php?t=7177&highlight=bugstuff

Bo Mows

Discussion Starter · #3 · Oct 12, 2005

As far as i can tell, it's a bosch coil and reg ignition.

jlthunder

· #4 · Oct 12, 2005

Since the 12 volt source is already there, you can upgrade to a petronix and a Flamethrower coil. Better spark and no points for under $100.00.

nobody

· #5 · Oct 12, 2005

Or you can go down to your local parts place and get a resistor for a 70s chrysler ignition for about 4 bucks and be done with it.

baronbors

· #6 · Oct 12, 2005

nobody said:
Or you can go down to your local parts place and get a resistor for a 70s chrysler ignition for about 4 bucks and be done with it.

Thats what I did three years ago and forgot all about it

jlthunder

· #7 · Oct 12, 2005

nobody said:
Or you can go down to your local parts place and get a resistor for a 70s chrysler ignition for about 4 bucks and be done with it.

Didn't know that would work. Cool

bear

· #8 · Oct 12, 2005

You can also use a ballast resistor from GM for the same application. Either works just fine.

Bo Mows

Discussion Starter · #9 · Oct 12, 2005

Thanks guys!!

Bo Mows

Discussion Starter · #10 · Oct 12, 2005

Is this a resistor a wire or an actual electronic resistor? If it's an electronic resistor, does it matter where it's placed? (close to coil or fuse panel?)

Bo

bear

· #11 · Oct 12, 2005

Bo, it would probably be easier to put the resistor in the engine compartment. Just run a wire from the fuse panel to the resistor, then from the resistor to the + side of the coil.

baronbors

· #12 · Oct 12, 2005 (Edited by Moderator)

Bo Mows said:
Is this a resistor a wire or an actual electronic resistor? If it's an electronic resistor, does it matter where it's placed? (close to coil or fuse panel?)

Bo

The one I got was a ceramic piece about 1/2 inch square and about 3 inches long with a slide terminal on each end. Painted it black and mounted in the engine compartment somewhere- don't even remember where I put it

nobody

· #13 · Oct 12, 2005 (Edited by Moderator)

Mine is on the engine compartment side of the drivers footwell along with 3 relays to protect all circuits in the car, start, run and all accessories.

BDD

· #14 · Oct 13, 2005

What does the resistor wire do and what resistance in Ohms should it have?

bear

· #15 · Oct 13, 2005

What that resistor wire does is drops the voltage from the 12 volt system down to 6-9 volts going to the coil so it won't overheat and burn up. During starting a separate wire from the starter solenoid powers the coil with full system voltage to ease in starting. As far as what the wire measures, I don't know, I trashed mine when I pulled the engine for the swap. Maybe someone on the list can measure theirs and post it.

DESTEC (R.I.P.)

· #16 · Oct 13, 2005

The coil primary is about 3.3 Ohms; so is the GT resistor wire.

12 * R2/R1+R2 = 6

Hence about 6VDC at the doil + (as Ron mentioned)

DESTEC (R.I.P.)

· #17 · Oct 13, 2005

You don't have a Bosch Blue doil??

Bo Mows

Discussion Starter · #18 · Oct 13, 2005

Does it matter if it's a Blue Bosch? That's what is on mine. Does the resistor wire still apply to these?

Bo

gr_diver

· #19 · Oct 27, 2005 (Edited)

Most Bosch Blue coils don't need a ballast resistor, because they have one integrated in their housing (there are some rare "Made in Mexico" and "unknown origin" that don't, which should be avoided cause they are crap anyway; everything "Made in Germany/Spain/Brazil" will have a resistor).

This is my set-up for the past 5 years. I replaced the resistor cable for a regular one going directly to the "15" terminal of the blue coil. Has worked beautifully, and never had breaker-points getting fried...

You can verify that your coil (and any coil) has integrated ballast resistor by measuring resistance between the "1" and "15" terminals. Below 1 Ohm, no resistor, above 3 Ohms there is one...
So, if you have the second case, with integrated resistor, you shouldn't worry, you are running a correct circuit...

Hope this helps

P.S. My old blue coil was made in spain and had a plastic cover, and used to get hot. A new one I just purchased (made in Brazil) has a beautifull polished metal cover (Bosch 0 221 119 027) that looks nice, and keeps it cooler!!! good iffo about bosch blue coils at:

http://www.ratwell.com/technical/BlueCoil.html

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2 Fast 4 U

· #20 · Oct 27, 2005

I measured the resistance of the wire [2.5 ohm] and the coil [1.9 ohm] if you want to use a normal resistor make sure that the power dissapation is correct
for this example coil = 1.9 ohm + wire = 2.5 ohm =4.4 ohm this means that 12 volt / 4.4 ohm = 2.7 Amps flow thru the coil and wire this means that the voltage over the wire is 2.5 ohm * 2.7 amps = 6.75 volt. The power that the resistor has to dissapate is the 6.75 volts * 2.7 amps = 18.23 Watt so your resistor has to be at least as in this example 2.5 ohm and 20 Watt
I hope this was explained wel for everyone

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