Ironhead 72 xlch is overcharging... bosch mechanical reg

[DR DICK]

[rocketnorton]

Originally Posted by DR DICK

if lead acid battery:
do post 13.
that diagnoses 95% of these issues.


if that shows good then battery may have lost some internal resistance.
that leads to allowing more amp flow thru battery, hence heating it up.


reduced resistance can be caused by structural damage inside battery. think vibration.

it was lead acid batt, bout 18mo old, see thru case
one cell would turn brown recently after running
was one @ + post
readin bout that led me to think overcharging
bike showed no probs, other than hi vm readings at speed
if the batt hadnt been see thru, ida been blissfully ignorant...

have sealed [agm? - not sure how to tell] batt now
vm hits 15+v at bout 6000rpm now
lights have never "flash bulbed" on it, have seen that happen on more than one ol mopar tho
will try post 13 tests again, and did fix up reg mount while i was there
batt box n reg mount were not flat on rubber mounts

thx, dr.

[DR DICK]

Originally Posted by rocketnorton

it was lead acid batt, bout 18mo old, see thru case
one cell would turn brown recently after running
was one @ + post
readin bout that led me to think overcharging

understandable.

Originally Posted by rocketnorton

bike showed no probs, other than hi vm readings at speed

seems you may have diagnosed yourself.
your taking your vm with you on rides?
grease the battery terms to keep oxygen off. make sure battery vent is clear, and ride on for now.
the best diagnosticians feel something is wrong in their gut, then hawkeye every mile/km until the bike better directs them.

Originally Posted by rocketnorton

lights have never "flash bulbed" on it

and you wont: you have a giant electrical seawall, a battery.
it keeps surf on the seaward side.


battery bikes and mag bike are two different creatures just because of that battery.

there is no seawall on mag bikes, so thier problems and solutions are also different.

[rocketnorton]

i was gettin vm readings from a gps speedo that had a vm in settings
digital - read some bout numbers bouncin round @ hi speed
also tested w/multimeter, lil lower, still hittin 15.9-16v
lights on dropped it few 10ths
mounted analog vm yesterday, rainin
road test tday
here's hopin...
will post back when done

[rocketnorton]

the analog shows 13-14ish v, 3-4k rpm
bout 15 @ 5k
16 @ 6k
lights on