I have a Hot Sparks ignition in a 1970 280se mercedes.The problem that
i am having is >14.5 volts to the ignition,even though there is a new Beru
voltage regulator and 1.4 ohm ballast resistor which is placed between the coil
and distributor.The coil is a BOSCH blue with 3.3 ohm primary.The coils resistance was tested.
Do i need a BOSCH voltage regulator.?Iam willing to go that route if it
is the solution.The BOSCH regulators are 10 times more expensive.
Also of note,the engine is running rough and i suspect it may be related.
Would greatly appreciate any help with this problem.
Best regards .
Garth.

Ballast resistance would normally be located on the switched power (+12V) side of the coil. If located on the negative, distributor side of the coil, the observed voltage at the positive side of the coil will always be system voltage.

Thanks for your response.The ballast resistor is on the positive
side of the coil.Any other thoughts.?
Best regards.
Garth.

Your first post placed the resistance on the negative side; now you say it is on the positive side. Did you rewire? Or misspeak?

I never mentioned which side the resister was on in my e mail.
I assumed it was known to be on the positive side.

1) What e mail?

2) In YOUR Post #1 you state "ballast resistor which is placed between the coil and distributor". If the resistor is electrically between the coil and the distributor it is on the ground side, which is the negative side!

Excuse me ,should have said post.
The resistor is positioned from the red wire from hot spark module within the
distributor to the positive terminal of the coil.
Hopefully this will clarify what i am saying.
Best regards.
Garth.

Consider posting a copy of the "hot spark" wiring diagram(s) as supplied by the manufacturer.
Quite likely a pic will enhance clarity.

Why don't you install what Mercedes installed in the first place? Do you know something that Mercedes Engineering doesn't?
Anziani
'97 Cl600 52K

an early attempt at reducing smog,was to make a cooler spark.But they noticed later a hot spark was better for mileage with a cat. I'd use the resistor if there was testing,but enjoy a hotter spark for mileage and power.

__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran

Problem solved. The Bosch voltage regulator did the trick.
now getting 13.7v to distributor.
Regards
Garth.