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Re: Fusible link for 12v alternator [Re: Hotrod Lincoln] #1309861
Mon May 06 2019 09:36 PM
Mon May 06 2019 09:36 PM
D
drdoug  Offline
Shop Shark
Joined: Aug 2018
Posts: 116
Prosper, TX
Phak1, you got it. Jerry's info on the connection style is good stuff.

Here's an image if the Western Union (aka Lineman's) Splice, in case you aren't familiar. They do provide a superior joint - strong and low resistance. In cases where the wires to be spliced will be soldered, I especially like this type of splice, since it isn't reliant on just solder for mechanical strength and low resistance.

Attached Files
Western Union Splice.gif (142 downloads)
Re: Fusible link for 12v alternator [Re: Phak1] #1309935
Tue May 07 2019 01:10 PM
Tue May 07 2019 01:10 PM
P
Phak1  Offline OP
Wrench Fetcher
Joined: Feb 2019
Posts: 72
Upstate NY
Would a waterproof heat shrink tubing in place of the self-vulcanizing rubber tape work as well?

Last edited by Phak1; Tue May 07 2019 01:11 PM.

1952 Chevrolet 3100 w/59’ 235
Re: Fusible link for 12v alternator [Re: Phak1] #1309940
Tue May 07 2019 02:12 PM
Tue May 07 2019 02:12 PM
H
Hotrod Lincoln  Offline
Boltergeist
Joined: Feb 2004
Posts: 18,564
Dellrose, TN
Yes, as long as there are no wire ends sticking up to pierce the shrink tubing. I'd do both- - - - -a "belt and suspenders" approach to holding up your pants guarantees you won't moon anyone!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Fusible link for 12v alternator [Re: Phak1] #1309996
Wed May 08 2019 12:24 AM
Wed May 08 2019 12:24 AM
P
Phak1  Offline OP
Wrench Fetcher
Joined: Feb 2019
Posts: 72
Upstate NY
Thanks all for your help. Great forum, great people!


1952 Chevrolet 3100 w/59’ 235
Re: Fusible link for 12v alternator [Re: Phak1] #1310011
Wed May 08 2019 04:25 AM
Wed May 08 2019 04:25 AM
T
TRUCKBIZ  Offline
Wrench Fetcher
Joined: May 2009
Posts: 61
far north east illinois
For your consideration; I was concerned to not damage the original ammeter after I installed an alternator so I ran a wire direct from the alt. to the starter battery connection.I left the original wiring hooked up to power the dash ect. as usual. I know this renders the ammeter mostly useless but it also guarantees no damage to the ammeter or wiring as my 49 is mostly stock. It would be simple to wire the idiot light or a volt meter if you think you need to.
Sorry I don't remember what amp my alt. is, its under 100, for sure, I wanted one I could buy off the shelf at any parts store.
In this case I suppose you would want to put your fuse-able link on the starter connection and attach it to both the original wire harness and the jumper wire.


1949 3100
Re: Fusible link for 12v alternator [Re: Phak1] #1310014
Wed May 08 2019 05:18 AM
Wed May 08 2019 05:18 AM
H
Hotrod Lincoln  Offline
Boltergeist
Joined: Feb 2004
Posts: 18,564
Dellrose, TN
A simpler method of protecting the ammeter would be to put a shunt across the terminals to bypass some of the current flow while still allowing it to indicate charge/discharge conditions. I like to use a piece of stainless steel radiator hose clamp bent into a horseshoe shape on the ammeter terminals to carry most of the current. It has just enough resistance to shunt enough of the current through the meter to make the needle deflect.+/-.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Fusible link for 12v alternator [Re: Hotrod Lincoln] #1310119
Thu May 09 2019 12:24 PM
Thu May 09 2019 12:24 PM
T
TRUCKBIZ  Offline
Wrench Fetcher
Joined: May 2009
Posts: 61
far north east illinois
I like that, improvements that go unseen.


1949 3100
Re: Fusible link for 12v alternator [Re: Phak1] #1310125
Thu May 09 2019 01:45 PM
Thu May 09 2019 01:45 PM
P
Phak1  Offline OP
Wrench Fetcher
Joined: Feb 2019
Posts: 72
Upstate NY
Jerry,
Can you expand a little on how to fabricate this shunt.

Are you talking about the clamps that are about 1/2” wide?
Do you use the part of the clamp that is solid or the part that goes thru the screw?

I assume when you said “bent into a horseshoe”, you would also bend out tabs to attach to the terminals.


1952 Chevrolet 3100 w/59’ 235
Re: Fusible link for 12v alternator [Re: Phak1] #1310131
Thu May 09 2019 02:47 PM
Thu May 09 2019 02:47 PM
H
Hotrod Lincoln  Offline
Boltergeist
Joined: Feb 2004
Posts: 18,564
Dellrose, TN
You've got the basic idea. Cut a strip of the clamp that's solid, about 2" long or a little more, and bend it into a "U" shape with tabs bent at right angles to the main loop. It will resemble the "Ohms" symbol used on wiring diagrams. Drill holes in the tabs to fit over the ammeter terminals. Install the shunt onto the terminals, then connect the wiring as usual. All the connections EXCEPT the wire going to the starter cable connection get attached to the downstream side of the ammeter. That way, all the current going in and out of the battery except the starter current passes through the ammeter and/or the shunt. The shunt prevents the ammeter from deflecting full scale during heavy current situations like just after starting, while still allowing enough current to take the original path to indicate a charge/discharge situation. It's a simple, inexpensive fix that protects the original ammeter from overloads.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Fusible link for 12v alternator [Re: Hotrod Lincoln] #1310142
Thu May 09 2019 04:11 PM
Thu May 09 2019 04:11 PM
P
Phak1  Offline OP
Wrench Fetcher
Joined: Feb 2019
Posts: 72
Upstate NY
Thanks! I’ve got my gauge cluster out so I’m going to do this upgrade now. I report back how it went.
Thanks again!


1952 Chevrolet 3100 w/59’ 235
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