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Electrical: Engine Starting, Charging
was charging; it provided a dependable excitation voltage source to the alternator
that would only be on when the ignition switch is on; and it provided a current
limiting device (the light bulb element) to the alternator excitation circuit. The bulb
element will handle the current that is required to excitate the alternator field.
Alternator Removal and Replacement. Disconnect battery negative and the
wires at the back of the alternator, carefully labeling each so you can replace them
at the correct terminals. See the
See the
FAQ file
Installing Rebuilt Alternators.
[Joe Avsec] I just installed a remanufactured NAPA alternator and one of the
housing srews vibrated loose after a couple of days. It vibrated to the point where
it came in contact with the fins on the alternator pulley, breaking all of them off
and making a terrible sound.
[Kevin O'Brien] Had the EXACT thing happen with my last rebuilt alternator: the
screw came out, put stress on the pulley, and loosened the main nut on the
alternator shaft. [Editor] This suggests you use Loctite on these screws before
installation.
Alternator Getting Weak; Regulator/Brush Replacement.
[Symptom:] The alternator on a 740T / B230 engine is getting weaker, slowly but
surely. What to do?
Bosch Alternator:
Regulator/Brush Change. [Editor] You likely need either a new regulator
(screwed into the back of the alternator) or new brushes on the existing regulator.
Swapping regulators is easy. The regulator has attached to it a set of brushes that
contact the commutator. To replace the brushes, you will need to solder the new
ones in place according to the instructions below. Also: Often the failure of an
alternator is the result of a blown diode or a worn out bearing, etc. These parts are
not expensive and their replacement is not difficult with the right tools. ($300+
alternator replacement cost for a burned out $10.00 part, what a scam!) With a
little looking, I found a shop in my area that repaired the alternators (new
bearings, brushes, leads, whatever else was needed) for about $70. All I had to do
was get the alternator out of the car and bring it to them. This may be a way to go
for your car. Note: regulators and brushes may be replaced on both Bosch and
Nipon-Denso alternators.
Inserting the Regulator Back Onto the Alternator. [Randy Starkie] To keep the
new, loger brushes from hanging up on installation, tip the assembly into place to
position the brushes before straightening it up. After you push on it to straighten it
the brushes are pushed back into the holders. Holding it in that position and then
installing the screws usually works for me.
Soldering Tips: Earlier Wires Soldered to Terminals. Drill out the brush wire
with a 1/16" bit where it is soldered to the brush holder. Brushes are available
from Volvo for less than $4.00 (probably part number 1362710 for your car- they
file:///C|/Users/Steve/Documents/Volvo%20FAQ%20Updated/ElectricalStarting.html[01/13/14 10:02:47 PM]
procedure
under Engine: Mechanical for removal of the alternator pulley.
above for removal of the alternator.
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