[C320-list] Alternator Wiring Question

[Bruce Heyman]

Just wanted to comment that fuses are usually sized to protect the wire.   Unless you've changed the wire I'm not sure you should change the fused.  There are tables that tell you what size of fuse you need for the gage of wire.  If the original fuse was smaller than needed to protect the wire then you might be ok moving up to the 100 amp.

Bruce Heyman
(949) 289-8400
bruceheyman at cox.net


-----Original Message-----
From: C320-list <c320-list-bounces at lists.catalina320.com> On Behalf Of Mark Seyler
Sent: Monday, June 29, 2020 9:40 AM
To: C320-List at Catalina320.com
Subject: Re: [C320-list] Alternator Wiring Question

I was able to find the fuse.  It was an in-line fuse around the back side of the engine, as Bob pointed out.  It was a Bussman Semiconductor Fuse Model 80 LET.  Because I am upgrading to an 80amp alternator from the OEM 55amp, I upped the fuse to a 100amp fuse, which gives me about the same amount of leeway on the larger capacity alternator.  I found it at the link below:

https://www.allfuses.com/100let 

Thanks for the help.



Mark Seyler
S/V Reality, 
Catalina 320, #232
New Orleans, LA




-----Original Message-----
From: C320-list [mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of amshd2 at aol.com
Sent: Monday, June 29, 2020 10:54 AM
To: ptormey at 4square.net; c320-list at catalina320.com
Subject: Re: [C320-list] Alternator Wiring Question

Lucas built both internal and external grounded alternators that run on a M30.
If you wire the ground wrong it will not produce any output. Tony 


-----Original Message-----
From: Pat Tormey <ptormey at 4square.net>
To: c320-list at catalina320.com
Sent: Mon, Jun 29, 2020 8:00 am
Subject: Re: [C320-list] Alternator Wiring Question

I don't know that issue, but you can use a multimeter to confirm continuity. Just read both ends based on the color code


 




Pat Tormey







On Sun, Jun 28, 2020 at 3:08 PM -0400, <mseyler at cox.net> wrote:










This question is mainly for those who have a C320 with a Perkins M30 engine,
although I'll take help from anyone.

 

I am replacing my OEM Lucas A127 alternator with an 80-amp Lucas alternator
from Parts4Engines.com. The wiring connections are the same on both
alternators, but I am not getting any output from the replacement.  One
possible issue is the ground wire attached to the "B-" connection on the
alternator.  The wiring diagram in the Perkins Workshop Manual shows a fuse
in that line somewhere, but I can't find the fuse because the wire
disappears into a wiring harness bundle.  

 

Does anyone know whether the harness really does have a fuse, and if so
where it is located?  Bonus points if you can also tell me where I would
find a replacement if the fuse is blown.

 

Thanks in advance for any help.

 

Mark Seyler

S/V Reality, 

Catalina 320, #232

New Orleans, LA