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 Post subject: Alternator Output Wire
PostPosted: Fri Mar 11, 2016 2:43 pm 
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998cc
998cc

Joined: Tue Sep 06, 2005 1:26 pm
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Location: Adelaide
I noticed that the thick wire running from my alternator to the solenoid battery positive cable is not fused at all. I understand that some car manufacturers purposefully did not put a fuse in this wire connection. Others, like Ford and Honda, use fusible links located near the battery. As the wire is connected to the positive terminal it looks sensible to me to include a high amp fuse or even a circuit breaker in case of a crash that could damage this wire and possibly start a fire.

So my question is why do some makes have fuse protection on the alternator to solenoid / battery post wire and some do not? And do you think it is advisable or not to install one (fusible link or circuit breaker)?

 

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PostPosted: Sun Mar 13, 2016 6:58 am 
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1275cc
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When I do a Repair or rewire on a Mini I always persuade the owner that it makes sense to have a fusible link on the main power wire. Minis were built before fusible links were introduced. I know they don't look original but they look better than a Toasted Mini! I use the plug in type fusible links and a proper plug. If you don't like the look just wrap it up in a piece of black plastic to hide it. It it puts your mind at rest having one. You never know what can happen when you don'e have one fitted.

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PostPosted: Sun Mar 13, 2016 10:13 am 
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998cc
998cc

Joined: Tue Sep 06, 2005 1:26 pm
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Location: Adelaide
I agree back in the day nothing used fuse links between alt and battery.

I was thinking of something like this http://www.12voltplanet.co.uk/midi-stri ... older.html

with the fuse specced at approx 10% higher than the output of the alternator [i.e 60 amp fuse for 50 amp alt].

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PostPosted: Sun Mar 13, 2016 10:56 am 
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1275cc
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Do you have an electric fuel pump with a tachometric relay?


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PostPosted: Sun Mar 13, 2016 11:10 am 
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848cc
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Joined: Thu May 14, 2015 9:57 pm
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Location: SE Melbourne
Convertible Mini wrote:
When I do a Repair or rewire on a Mini I always persuade the owner that it makes sense to have a fusible link on the main power wire. Minis were built before fusible links were introduced. I know they don't look original but they look better than a Toasted Mini! I use the plug in type fusible links and a proper plug. If you don't like the look just wrap it up in a piece of black plastic to hide it. It it puts your mind at rest having one. You never know what can happen when you don'e have one fitted.


Toasted my battery and pos this weekend. Required new battery and replacement positive line to Solenoid. Didn't think of a fusable link while doing the install. Have a switch on neg, but too slow to stop the toasting !

Can you send me some details ? I've always thought the battery arrangement in the boot with a cardboard cover was suspect and a potential risk. (Not that a link at the other end would protect a short across the battery posts)

Don't ask me how I performed the toasting ! :oops: :roll: :cry:

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PostPosted: Mon Mar 14, 2016 8:10 am 
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1275cc
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If you cooked the lead between Alternator and solenoid it can only be caused by a few things... Alternator diodes Faulty, Alternator wired incorrectly or incorrectly connected battery reverse polarity.

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PostPosted: Mon Mar 14, 2016 5:44 pm 
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848cc
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Joined: Thu May 14, 2015 9:57 pm
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Location: SE Melbourne
Convertible Mini wrote:
If you cooked the lead between Alternator and solenoid it can only be caused by a few things... Alternator diodes Faulty, Alternator wired incorrectly or incorrectly connected battery reverse polarity.


My cooking was the positive from the battery to the solenoid. Due to a hard short to the body :oops:
Not sure if the OP has an issue. I think he is more pondering the options.

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PostPosted: Mon Mar 14, 2016 8:54 pm 
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1275cc
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Location: JIMBOOMBA QLD.
Fusible links close to power sources are always a must in my books these days.

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