I have been upgrading my GMC 4x4 Jimmy,
The 12si altenator has been acting strangely, mostly at the Gauge (movement of needle)
ticking to the top left?and discharging with every accesory I could turn on it gets worse,
The Voltage Sensing Wire on the Altenator has been replaced with new pigtail.
It also ticks the Digital Multi Meter up and down with false readings?
I have added a new HEI unit that is same as factory standard, for the TBI
,it had millage issues and eventualy they short out by wear at the reluctor and Pick up unit and leave you stranded
it has no Vacumn advance,is Controled by Transmission for advance, and emission's Spark Knock sensor,and ECM.
Also new cap and rotor ,wires looked good, tested good,
The Spark plugs have just been changed and I have noticed for week's that a come and Go miss would happen
And is driving me up the wall,as this hapened before a year or two ago. then went away,
and the Ticking was going on then!!
the old plugs looked great,so i thought I would look for it again,But where ,,It come and Goe's
Today I went to the local Muffler shop pulled on to their Rack and it started doing it again,11-12 volts ticking, and a definate miss in 5.7 SBC motor,
The muffler Mechanic checked for leaks and using a Simple 5/8ths heater hose 3 foot long,at his ear
for a Stethascope for hearing the exhaust leaks he found none,
However the Clicking noise of a "ARC" ing sound near #2 plug,
Going back to the Shop I pulled a Set of Spare wires for the "Monza's" ACCEL units ,
and pulled # 2 wire off the plug and cap when I noticed the Spark Plug Boot was torn down Side,
a Crack was missed last week, My fault It was arcing to exhaust manifiold ocassionaly i would guess,
Then replacing boot with the Accell boot,adding Silicone additive package,
plugged it on plug n' cap went fo test drive, so far it is smooth will replace all tomorrow,
Also noticed the Altenator was No longer Ticking but Charging at 13 or a little better,
Edit on 08-12-08 the test drive again has shown the ticking is gone and is Charging again,whatever I throw at it.
Any body have a Theory,
On HEI Spark Grounding/Altenator Discharge Ticking???
Making the Voltage Sensing Wire not respond to changes in the Added Load like Electric fan,at Radiator, and personal Fan inside to blow A/C to the back Camper,
I was Thinking maybe it Is Interfering with Voltage Regulator in Altenator.
,,,,,,,,,,,,I guess it could happen on an H-body as well.,
,,My turn sigmnals in Monza also Tick my Voltage Gauge,but that is a another Post for later,
Mike