Where does the Ballast Resistor live??

**HangOver** · 19th February 2007, 04:04 PM

SO……Where does the Ballast Resistor live??

I have a CraneCams XR700 electronic ignition module that ties into the existing coil and distributor. I recently learned that it should run a Ballast Resistor, Oops.

My understanding is that the resistor sits in-line on the + side of the Coil on the + wire from the ignition, (I presume ignition anyway).

So the + cable goes : Harness --> Resistor --> Coil

(ps the electronic ignition + is attached to the same side of the coil as the + from the harness that I think I connect the resistor to).
Does this rambling sound correct?

Ta for any advice
Steve

**p38arover** · 19th February 2007, 04:14 PM

See this thread: http://www.aulro.com/afvb/showthread.php't=34624

Ron

**LandyAndy** · 19th February 2007, 06:04 PM

Hi Steve
Maybe you dont need it???????.
Wait for more brainstrust answers first.
The aftermarket ignition wouldnt use it I wouldnt think.
Other than that call into an auto sparkie or search the crane website.
I sort of remember when I first put the 302 in my 109,it was doing weird stuff,just had to change coil types to suit.
Goodluck
Andrew

**justinc** · 19th February 2007, 07:33 PM

If this helps, I had a query regarding lumenition on a 3.5, they told me it is compatible with or without a resistor.....

JC

**LandyAndy** · 19th February 2007, 08:09 PM

Hi Justin
Pretty sure you are pushing the same barrow.As far as I know these aftermarket systems run a full 12V,no need to reduce it with a ballast resistor.Just what I understood but didnt want to get shot down in flames(or sparks for that measure).
Andrew

**Ralf_the_RR** · 19th February 2007, 08:26 PM

I have the Allison 700 which is the same as the Crane 700 (buy out).
It relies on the ballast resistor.

Now Rangies have 2 wires going to the +ve of the coil.
White/Pink & White/Purple.
The White/Purple provides 12V whilst cranking.
The White/Pink has an integrated resistance wire which drops the voltage (9v I think), and is used for normal operation.

If you put 12V (continuously) into a non ballast coil, it will burn out.

lokka · 19th February 2007, 09:15 PM

Like you said steve wire from ignition switch 12v to ballast resistor then from resistor to coil then run another wire from the key wire at your starter motor to the coil bypassing the ballast this is to give the coil a burst of 12v at cranking for an easier start once the motor is going and key in run pos the 12v from the starter drops out and the feed through the resistor takes over .

This method will work fine without hassels with a resistor wire from the ignition and will prolong the life of ya coil if down the track you get a real 12v coil just remove the resistor and the extra wire from the starter

cheers

Chris

**Bradtot** · 19th February 2007, 10:17 PM

Steve get a multi meter and measure your voltage to the coil on the positive side while it is running.
12v means no ballast 8-9v means you have ballast wire in the original loom as per what Ralph the rangie has said
My 82 still has the ballast insitu with optospark
never had an issue
Brad

**DEFENDERZOOK** · 19th February 2007, 11:14 PM

Originally Posted by HangOver

SO……Where does the Ballast Resistor live??

isnt it the one behind the glovebox.....?
or was that for the fan.....?

how old is the rangie......?

**HangOver** · 20th February 2007, 12:24 AM

Hi All
Sorry about the lack of reply I had the top off engine in the Falcon tonight trying to fish out bits of plastic filter/breather that had shattered and were bouncing around inside the rocker cover.

Bloody ford honestly wish I had never bought it. < rant over.

The good vehicle I own, (1981 Rangie) has an XR700 ignition.
I called the only?? supplier in WA, (that I could find) in Welshpool.
They said that the 3000 has a built in resistor so you can use anything. The xr700 that I have needs a ballast resistor and should not be run at 12v.

They said I should fit a ballast resistor and one of the coils that they recommend, (read supply) $80 hmmm I think not !

I called back later and spoke to someone else I got the same story but suggested I can use any coil that requires a resistor. I am running a GT40r that requires a resistor so I'm OK there. I got a resistor today for $8.

I just wanted to ensure that it does sit in-line on the + side of the coil just before it attaches to the coil.
And.. the ignition unit connects to the same side of the coil, (on the same spade connector).

I think it should but you know what assumptions do !

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