You bring up a good point Bob.
I had in my mind that 67.5 and up Roadsters had two wires to the coil. One
is full voltage from the ignition switch in the 'start' position only and
the other is routed through the ballast resistor in the 'run' position.
I have not traced my wiring to confirm this, and the wiring schematics for
the 67.5 don't show it. My coil does indeed have two wires going to the (+)
on the coil. If these wire were switched, it would not stay running in the
'run' position.
Things keep pointing to a wrong ballast resistor......
On 3/15/11 3:52 AM, "bubwin@mymts.net" <bubwin@mymts.net> wrote:
> Are you running points? Also check and make sure the feed to the coil when
> in run mode, comes from the Ballast resistor. The ballast resistor should
> be cutting that voltage down at the coil, once started. Acceptable
charging
> is usually considered around 14.2 v, give or take. (anything between
> 13.5-14.5 is good) Although a bit high, I don't think it's the cause of the
> problem.
>
> Bob
>
> -----Original Message-----
> From: Hall, Phillip B. (MSFC-ED10)
> Sent: Monday, March 14, 2011 7:27 AM
> To: Datsun-Roadsters
> Subject: [Roadsters] Charging Question
>
> So, on my 67.5 it was not charging very well. The battery would last a few
> days then start to go down hill. I replaced the regulator and drove it a
> few
> miles. I picked up my daughter and on the way back the amp gage went to
> about
> 15 amps charging, cool! As this happened, the Roadster started getting a
> bad miss. I pulled over thinking something came loose. Found nothing and
> eventually unplugged the alternator and it ran great.
>
> This weekend I put on a one wire GM alt my son had a new Powermaster
unit.
> Same thing...... Plugged in the car has a bad miss, unplugged it runs
> great.
>
> I have gone through and cleaned the plug from the starter (that powers my
> ignition), reworked my ground cables (stock locations battery, block,
> frame,
> body), replaced the wire from the reastat to coil which was just holding on
> by
> 2 strands,,,,,,, Every time I make something better it misses worse. Now
> with the alternator plugged in, it misses bad even back-firing through
the
> carbs. Unplugged runs great.
>
> I an going to check the voltage at the coil, but I did not have help and
> cant
> keep it running with the alt plugged in.
>
> Ideas????
>
> Phil
> SEROC
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