In my car, the Crane XR-700 red line goes to the 'hot' side of the (blue)
coil, the yellow to the other side, and of course the sensor bundle goes
into the dizzy. Seems to work OK, I've put 2000 miles on it in a couple of
months.
My complaint is really long time to warm up, and sputtering performance,
particularly on cold nights. But I've got other issues, like I discovered
Sat am just before setting out on a trip to the coast that the PO has set
the throttles 5 or 10 degrees apart, the one idle stop was screwed down
tight, and the other was waaay out. After a Holy-S**t moment, I loosend the
linkage and evened them up, and wow what a difference. Took the rough
throbbing idle down from 1000+ to about 700 revs and smooth. No time to
actually tune / synch them, just a hack to get on the road.
So I have to side with Randall on this one, the red wire isn't critical,
just enough to power LED unit. But he talked about "phase" problems with the
Crane, I moved my sensor a good 1/8" clockwise and re-timed it with a light
and it seemed to help.
january
66 TR4A CTC74217LO
-----Original Message-----
From: aribert [mailto:aribert@c3net.net]
Sent: Monday, July 09, 2001 2:31 AM
To: triumph list
Subject: ballast resister voltage drop - electrical guru needed
My '71 GT6 has a Crane XR-700 ignition system. With the engine
running: alternator voltage is 14.2v, voltage into ballast resistor is
13.8v, voltage out of the resistor is 9.2v. Ballast resistor reads 1.7
ohm (catalog rated at 1.35 ohm). My coil (MSD Blaster 2) reads 1.1 ohm
across the terminals. NOTE: both of my multimeters read 0.3 ohm thru
the leads alone so all of the above resistances could be off.
Additional electrical trivia: Blaster 2 coil came with a 0.8 ohm rated
ballast resistor and Crane specs a 1.2 to 1.9 ohm resistor.
What could be causing such a large voltage drop? Speaking to the people
at Cranes tech line, the XR-700 likes to see 10 to 12v at the coil(+)
terminal for their module - essentially 2v drop from charging voltage.
Reason for this post is that my idle is rough/eratic and the car needs a
bit of choke (triple Weber 40DCOEs) until warmed up. Engine fires
IMMEDIATELY (when ballast resistor is bypassed) on cranking but if the
choke is not partially engaged, the engine will die with in a couple of
seconds. Crane's techs tell me that if the module input voltage is too
low the transistor does not know whether to fire or not - which could
cause a rough/erratic idle.
Off in digest mode, awaiting responses. TIA
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