[TR] TR4 Alternator Conclusion (I Hope)

LBC.Resto lbc.resto at verizon.net
Mon Apr 20 11:36:14 MDT 2009


I will take a look at this tonight.

Why would the readings be similar with engine on and no extra load, but
different when load is added?  Also what about the no load discrepancy at
low idle?  Not arguing, just trying to understand.

--
Ian
62 TR4


-----Original Message-----
From: triumphs-bounces at autox.team.net
[mailto:triumphs-bounces at autox.team.net] On Behalf Of Randall
Sent: Sunday, April 19, 2009 11:36 PM
To: triumphs at autox.team.net
Subject: Re: [TR] TR4 Alternator Conclusion (I Hope)

> 1. The belt squeals sometimes on initial throttle 
> application.

Check that all your pulleys are the correct width for your belt, and the
belt is not touching the bottom of the groove.  If all else fails, you may
need a slightly larger diameter pulley on the alternator (so the belt gets
more grip).

> 2. When driving it last night, I noticed that the ignition 
> light would gently glow at all RPMs.

Indicates that you have some voltage drop through the car's wiring; or
possibly a bad main diode in the alternator.

> - engine on, RPM >1000, but with extra load such as lights or heater fan
> - multi-meter read about 14.5 while car voltmeter was in the 13s and
slowly dropping.

Bingo.  There is a poor connection somewhere (might be the ignition switch
itself) and it's getting hot. Use your voltmeter to trace along the circuit
until you find the voltage drop.

Randall
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