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Forum: Vintage Mercedes Forum

01-27-2010, 08:35 PM

Replies: 48

72 280SEL 4.5 no spark

Views: 9,568

Posted By Tomguy

Unless they're bad, I'd keep them on. If they are...

Unless they're bad, I'd keep them on. If they are bad, unscrew the connectors & re-use them, just replacing the wire itself.

Forum: Vintage Mercedes Forum

11-02-2009, 09:19 PM

Replies: 48

72 280SEL 4.5 no spark

Views: 9,568

Posted By Tomguy

Harbor Freight sells 2 types of MityVac last I...

Harbor Freight sells 2 types of MityVac last I checked - the plastic one is about $20-30 and the brass one is about $40-50. Either will work just fine. Believe it or not, the plastic one is VERY...

Forum: Vintage Mercedes Forum

10-22-2009, 11:39 AM

Replies: 48

72 280SEL 4.5 no spark

Views: 9,568

Posted By Tomguy

I'd agree that eliminating ignition points and...

I'd agree that eliminating ignition points and trigger points would decrease service needed and increase reliability. Absolutely worth it if your vehicle goes on long trips or is a daily driver.

Forum: Vintage Mercedes Forum

10-20-2009, 09:18 PM

Replies: 48

72 280SEL 4.5 no spark

Views: 9,568

Posted By Tomguy

Your coil may have been replaced with a std blue...

Your coil may have been replaced with a std blue coil vs the one these cars need. If that's the case then you won't have much, if any, spark with either a direct connection or with a working ignition...

Forum: Vintage Mercedes Forum

10-20-2009, 11:10 AM

Replies: 48

72 280SEL 4.5 no spark

Views: 9,568

Posted By Tomguy

FWIW my MB went thru 3 of these. I didnt know...

FWIW my MB went thru 3 of these. I didnt know until I saw a ballast resistor smoking after putting the 4th on and "Resurrecting" it after several years of sitting that leaving the ignition on with...

Forum: Vintage Mercedes Forum

10-20-2009, 07:52 AM

Replies: 48

72 280SEL 4.5 no spark

Views: 9,568

Posted By Tomguy

Your timing might be off. The points are set for...

Your timing might be off. The points are set for dwell on an ignition box and not really for a direct setup. Just check to make sure, with a std timing light, you're "In the neighborhood" of TDC...

Forum: Vintage Mercedes Forum

10-19-2009, 08:27 AM

Replies: 48

72 280SEL 4.5 no spark

Views: 9,568

Posted By Tomguy

Pertronix does eliminate that box. To make sure...

Pertronix does eliminate that box. To make sure it's "That box" you can bypass it using an old-fashioned points and condenser setup to do the switching instead of the transistor box. Basically the...

Forum: Vintage Mercedes Forum

10-09-2009, 01:02 PM

Replies: 48

72 280SEL 4.5 no spark

Views: 9,568

Posted By Tomguy

Ron it tests both! Light flashes, bad coil. Light...

Ron it tests both! Light flashes, bad coil. Light doesn't, bad box! Pretty easy diagnosis :)

Forum: Vintage Mercedes Forum

10-08-2009, 09:03 PM

Replies: 48

72 280SEL 4.5 no spark

Views: 9,568

Posted By Tomguy

If you suspect the ignition box and other items...

If you suspect the ignition box and other items check out (coil, points gap, condenser wire to the box is unbroken & not shorted, condenser itself not connected, etc) here's how I test:

A 12v bulb...

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