Original coil?

What year E9 and US or Euro?

Also not to steal this thread but the location of that ground strap raises the question as to strap location correlated with year and model type etc. I do not have a ground strap in the location shown. I (6/73 Euro) have one from hood to radiator housing, engine block to battery and tranny to firewall. Some have described one near the MC. Ground straps seem to be like the E9 radio antenna.
 
Also changing to Hall effect kit, my 2800CS has this coil but i don´t see any resistor... do I need one?
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Stevehose said:
Check the instructions to your new kit to see if it requires one or not. That's a Bosch high output red coil - good to have.
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The kit says I can do without it if the coil has an internal resistance greater than 1.5Ohm - does it? The coil itself says "use only with ballast 1.8Ohm", but I cannot find one there... Maybe this is frying condensers and causing the rough running?
 
The Bosch red should have a resistance of 1.5-1.6ohms. You can measure across the + and - to see. If you are useing a hall effect then you've eliminated the condenser? If so you shoud be fine without a ballast resistor.
 
There is no internal resistance with the red coil, that is why it says you need 1.8 ohm. AutohausAZ has the red resistor with 1.8 ohms.
 
yes there is, but less than the black coil which is why you need a higher ballast number. So if he needs at least 1.5 ohms the red coil is fine without ballast. Put an ohm meter across + and - it should read 1.5 - 1.7. I have 3 including an nos original like his and they all do.

HB Chris said:
There is no internal resistance with the red coil, that is why it says you need 1.8 ohm. AutohausAZ has the red resistor with 1.8 ohms.
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Stevehose said:
yes there is, but less than the black coil which is why you need a higher ballast number. So if he needs at least 1.5 ohms the red coil is fine without ballast. Put an ohm meter across + and - it should read 1.5 - 1.7. I have 3 including an nos original like his and they all do.
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On the red coil label it says add 1.8 ohms resistor. Red and silver coils replaced the black coil which used 1.1 or 1.2 as I recall. Blue coils in the US are internally resisted.
 
That's for when using points/condensor, he's using a Pertronix type device.

HB Chris said:
On the red coil label it says add 1.8 ohms resistor. Red and silver coils replaced the black coil which used 1.1 or 1.2 as I recall. Blue coils in the US are internally resisted.
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But if he’s using the Hall system it say he needs at least 1.5 ohms so if using red coil the 1.8 ohm resistor is perfect. I think even Pertronix says keep the ballast.
 
Yes, and the red coil provides the 1.5. It's total resistance. Total resistance with a red coil and 1.8ohm ballast would be +-3.3ohms. 123 ignition has same requirements.
 
Steve, I had a red coil in my 69 2002 and it says you need an additional 1.8 ohms. That ballast was hard to find at the time but AutohausAZ had them. With the original 1.1 ohm ballast my coil would cut out and the engine would die while driving. Took a while to figure it out.
 
Was you ignition points and condenser or pertronix? 123 distributors and Pertronix run without ballast depending on the coil. I’ve put 20k miles on my non ballast red coil. Ballast was to protect the points. 12v shouldn’t overheat a coil.


HB Chris said:
Steve, I had a red coil in my 69 2002 and it says you need an additional 1.8 ohms. That ballast was hard to find at the time but AutohausAZ had them. With the original 1.1 ohm ballast my coil would cut out and the engine would die while driving. Took a while to figure it out.
Click to expand...
 
I just measured resistance of the coil (everything disconnected) and it read 1.8Ohm. Next, install the kit and disconnect the condenser.
Hope it's not the coil...
 
I'm not clued up on ignition electrics and I was hoping this thread would make things clearer but now things have just got more confusing with so many different points of view.
 
Your coil will tell you if you need a ballast resistor and how many ohms. This red coil must be a very early one perhaps.
 
Depending on what type of ignition setup you have will determine whether or not you need a resistor. Points and condenser, yes, either from a ballast or a wire depending on year and coil type. Pertronix and the like, as well as the 123ignition distributor (as per their instructions), you eliminate the resistor because it will put less than 12v to these devices as long as the coil itself has at least 1.5 ohms which all Bosch red coils have. The coil won’t burn out from 12v to it but points will.
 
Running smoother than ever, guys!
Same old Bosch red coil, no ballast, Hall effect kit and a reconditioned distributor. Started without hassle, timing was redone and everything feels and sounds OK.
Let's wait for the test of time and distance...
 
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