View Single Post
Old 05-16-2008, 12:08 PM   #5 (permalink)
Two Tone
BenzWorld Member
 
Two Tone's Avatar
 
Date registered: Dec 2007
Vehicle: 1969 Swiss 404 - 1977 Porsche 911 S
Location: Nova Scotia, Canada
Posts: 102
Output Voltage from ballast is high

I checked the other cylinders, the miss corresponds to a faltering timing light for all of them.

I checked the input voltage to the ballast resistor. 28.4V which I think is normal.

The output voltage from the ballast resistor however seems to be high.

25.2 Volts. I think this should be between 17 - 21 volts. I remember 18.9 at installation of the kit. All of these checks were done at 2800 rpm.

I assume this means I need a new ballast? It still gets hot but it's obviously not reducing the voltage enough. Does this also mean that the coil is wrecked?

I won't run it any further until I get this resolved to avoid possible damage to the ignitor.

So to summarize:

-Input voltage of 28.4 seems normal.
-Output voltage from the ballast is 25.2 which is way too high.

-Do I need a new ballast or is there a way to fix or substitute it?
-Is the coil ruined and is there a way to determine this?

Scott, let me know what you think. I'll order the appropriate parts from you as soon as I get your input.

Thanks.
__________________
Two Tone
______
Reading the instructions - a sure sign of weakness and uncertainty.
Two Tone is offline   Reply With Quote