Re: [ST] Tack and speedo dance

["halfast3" <halfast3@xxxxxxxxxxx>]

>>
Which temp sensor is this?  The coolant or air inlet?

The coolant temp sensor is on the left side of the engine above the
water pump.  With the ign *off*, try unplugging and replugging the
connector a few times to clean the contacts.  It wouldn't hurt to
disconnect and clean all the connectors in this manner.  

<<
Also if you haven't already done so, check for loose &/or corroded
ground connections, starting with the battery terminals and the
battery-to-frame ground. Suggest you disconnect and clean these.
>>
Battery cables tight and clean.  The main ground goes to the top of
the trans.  It was gorilla tight when I took it loose and checked it.
Clean and no obvious slop in the cable within about 6 inches.

This is where the voltage drop test is so valuable.  Testing from (+)
to (+) and (-) to (-) you can actually read the difference between two
points in the system.  For example, place one meter probe on battery
(-) and the other on the transmission.  The reading you see (with the
system operating) is the voltage drop between the two points, in this
case the battery ground cable.  Anything over .10 - .15 volt (100 -
150ma) should be considered suspect.

<<
Then check for voltage drops: http://tinyurl.com/fru4t 
>>
Using an analog meter it shows 14V across the battery posts at idle
and only goes down slightly as rev's rise, with no spikes or hitches
up to about 6k rpms.  I was cruising between 4k and 5500 at highway
speeds seeing this twitch.  I just skimmed through the proceedure you
give.  Might try a few places with that.

You really should have a digital meter for these tests.  Do you mean
to say the voltage *drops* as the rpm increases?  This is unusual!
Suspect regulator.

<<
An increase in light intensity as you increase rpm off idle is normal
as the alternator output below ~2k is less than the normal draw of the
system.  You may well have a bad voltage regulator but is that the
cause or the result of the problem?  Is the system voltage stable off
idle? Let us know what you find.
>>
Voltage is stable, but the lights still brighten and dim noticibly
with
rpms.  Convienetly Triumph used the same regulator(ie, same part
number) on
all triples and 4 cyls from '02 up to just recently(675 and Rocket 3).
Let's hear it for modular manufacturing!  $300 retail!  Fortunatly
E-bay is
a wonderful thing.

Found this online:
http://www.electrosport.com/electrosport_electrical_triumph.html 
--
Rick in Oregon
'01 Sprint ST



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