[TR] TR4 + alternator + headers

[Lee&John Howard]

The light is dawning....

So, the fusible link should be a 14? The heavy wire must be a 10 gauge,
right?

The old generator was rated at 25 amps I think.  So an inline fuse in the
sense wire might be a  30 British?

Yeah, I don't get the new apparent belt tightness either as I used the
original generator pulley on the alternator.  I'll try to make better sense
out of that.

Many thanks Randall for staying with this.

JOhn

On Sat, Feb 4, 2017 at 11:35 PM, Randall <TR3driver at ca.rr.com> wrote:

> > Is there any point in adding an inline fuse?
>
> There is probably something to be said for that.  Two of the wires
> effectively go directly to the battery, so a short is very likely to let
> the
> smoke out.
>
> But if the fuse in the output line pops (as they sometimes do), it is
> likely
> to kill the diodes in the alternator.  So a fusible link might be a better
> option.  First step would probably be to add a fusible link to the heavy
> brown wire at the starter solenoid (which should then protect the heavy
> gauge wiring to the ammeter as well as the alternator).
>
> Plus a smaller in-line fuse for the small brown sense wire to the
> alternator.
>
>
> > Is 55 amps a lot to push
> > through this wiring, thoughI have nothing that will draw that much
> > current .
>
> Yeah, it's on the high side; higher than many charts say is allowed.  But I
> ran this setup on my former TR3A for 20 years and never had a problem with
> wires overheating.  That was with a 65 amp alternator, and some added loads
> to take advantage of it. (Roughly 20 amps for high power headlights, 15 for
> the stereo, and 8 for the electric radiator fan, on top of the usual other
> loads and whatever the MSD 6 box used.)
> And of course the alternator should be going to full output right after
> starting the engine, to replace what the starter took out of the battery.
>
> > I'm surprised to find that the old belt is very tight and have to work it
> > over the pulley before bolting the alt. in place. It then rides very
> close
> > to the block and I begin to fuss about overheating the alternator.
>
> That's odd.  Mine actually fit better than the stock generator, one of the
> things I really like about the mini alternator.  With the generator, I
> always had to turn the engine to work the belt over the last pulley; but
> with the mini alternator I can do it with my fingers (and all the mounts
> just slightly loose).  The larger alternator on the TR3A required taking
> the
> mounting bolts out; which was a PITA especially when changing a belt on the
> side of the road (and a hot engine).
>
> I just measured the spare I got from Rock Auto; it's about 4-1/4" wide.
> The
> original early generator in the parts bin is 4-1/2", a later generator is
> 5".
>
> Randall
>
>
>
>
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