Re: M burning points

Posted by John T on May 31, 2006 at 06:22:24 from (66.244.90.5):

In Reply to: M burning points posted by Wicksfield on May 31, 2006 at 05:23:28:

Wicks, Im kinda thinkin along the same lines as Bob, heres some thoughts: Premature points burn up is often caused from excess current (around 4 amps or so should be the max) or a bad or not grounded condensor. You may need to check the primary resistance of that new "12 volt coil" as measured between its lil + and - terminals as it should be around 2.5 to 3.5 ohms or so such that the current is in that 4 amps range. The reason I say that is cuz some so called 12 volt coils are actually "12 volts" others "12 volts for use with an external ballast resistor" and some "12 volts NO external ballast required" YOU NEED ONE LABELED (or designed) 12 VOLTS NO EXTERNAL BALLAST. If your coil is one of those "12 volts for use with an external ballast" its in reality a 6 volt coil (primary resistance around 1.2 to 1.5 ohms) and your points are switching excess current and will burn up prematurely plus run hot. Some automotive 12 volt coils are lower primary resistance then the 3 ohms or so required for many points type ignitions, so to be safe, you need to measure your coils primary resistance and you need at least 2.5 preferably 3 ohms to protect the points as designed for.

If you can barely hold your hand on the coil cuz its so hot it may be a 6 volt (12 for use with external ballast)coil!!!!

Its hard to really test a condensor with an ohmmeter, you need a real condensor tester. An ohmmeter can tell if its bad/shorted and capacitance to some degree, but if in doubt have it tested or get a new one. Make sure its connected good to the points terminal and has a good case ground also.

The points need to close nice n even n flush with each other or they burn up quicker.

Let us know

John T

Replies:

Add a Reply Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]