[Rovernet] Another set of rare bits required.

Fri May 23 12:17:16 EDT 2014

Thanks!  I noted that it charged slowly and we made it all the way to San
Jose (there is an old song with those words, I think...) but in city traffic
the battery slowly died. Will seek and replace bulb!

AvMedSafe
Geoffrey W. McCarthy MD MBA DipAvMed
677 NW Melinda Ave Portland OR USA 97210
503-241-8468(h) 503-799-3809 (mobile)

-----Original Message-----
From: Rovernet [mailto:rovernet-bounces at rovernet.org] On Behalf Of Fletcher
Millmore via Rovernet
Sent: Thursday, May 22, 2014 10:51 PM
To: Rovernet
Subject: Re: [Rovernet] Another set of rare bits required.

The bulb supplies the excitation current for the alt to start working, which
is why it stops charging if the bulb goes. But, the bulb only blows if there
is a bad diode in the alt, which causes voltage to go way high. The bulb
gets real bright before it blows. So, the bulb is a sort of fuse - you have
a defective but not totally fried alt.  Some systems (GM I think) use a
resistor in parallel to the bulb to supply the current even if the bulb
fails, but you lose the safety aspect. I had an Austin America with this
problem (and no money for an alt), and as long as I kept it under 6000 rpm,
the bulb - and the headlights - would be bright, over 6000 pop! Got really
good at changing the bulb along the road in the dark.

Some alts will charge without the excitation current, as there is enough
residual magnetism to get things started once the engine is going fast
enough, after which it keeps charging even when the engine speed drops. 
We used to get that on Delco alts replacing other things (because we did not
know how to wire it correctly)- once you punched it up to 3500 it would work
and put the light out. All depends on the fine detail of the alt/reg
circuitry.

If the bulb NEVER lights, even when you turn the key on, it or some wiring
is dead. The alt should supply enough power at idle that the light does not
come on with engine running, even with low battery.

FRM

On 5/22/2014 7:23 PM, GeffMcCarthy via Rovernet wrote:
> Re NADA fuel pipes:  I removed all the charcoal canisters and lines in 
> my 3500S, but may reinstall to limit the fuel odor after every partial
fill.
> Does the charcoal deteriorate?  Can it be restored or refilled?  Thanks.
> PS:  The SD1 which I acquired in LA made it to Portland with only 1 
> snag: an alternator fault traced to the small alternator wire.  The 
> previous owner related that if the charging light bulb burns out, the 
> alternator stops charging.  I have not seen the bulb lit, even with 9V on
the battery.
> Interesting design fault, no?
> AvMedSafe
> Geoffrey W. McCarthy MD MBA DipAvMed
> 677 NW Melinda Ave Portland OR USA 97210
> 503-241-8468(h) 503-799-3809 (mobile)
>
> -----Original Message-----
> From: Rovernet [mailto:rovernet-bounces at rovernet.org] On Behalf Of 
> Kent Kinard via Rovernet
> Sent: Thursday, May 22, 2014 1:14 PM
> To: Rovernet
> Subject: Re: [Rovernet] Another set of rare bits required.
>
> Yes.
>
> JULIAN BARNARD via Rovernet wrote:
>> Hi there - I am in the middle of restoring a1969 NADA Rover 3500S Auto.
>> Unfortunately the previous owner removed the fuel tanks and although 
>> the
> main fuel tank is easy enough to get in the UK, it seems impossible to 
> find the Fuel Spill Return tank and associated fixings and pipework.
>> Has anybody in the Rovernet group got access to a set of parts such 
>> as
> these?
>> Julian Barnard.
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