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Author: Subject: Rectifer getting really hot
LBMEFM

posted on 15/7/20 at 10:56 AM Reply With Quote
Rectifer getting really hot

MK Indy- Fireblade

I have had a few wiring circuit problems lately which I have now solved, when the engine is running and while the cables were out of their sleeving I noticed the heavy yellow wires to the rectifier, the rectifier is from a Goldwing as the FireBlade one kept burning out, are getting very hot as is the rectifier. I have never had a problem with it charging before since fitting the Goldwing rectifier. The car has been in storage for many months and the battery is probably very low on charge, would this be the cause of the excessive heat while charging the battery or do you think there maybe another issue.

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adithorp

posted on 15/7/20 at 12:20 PM Reply With Quote
If my battery is s bit down on my r1, the wires get pretty warm. It worried me at first but been ok for 12yrs.
Is your rectifier mounted to a decent heat-sink? Mines on the steel drivers footwell and has a cold air feed to it.





"A witty saying proves nothing" Voltaire

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watsonpj

posted on 15/7/20 at 12:47 PM Reply With Quote
my fireblade one has a aluminium heat sink on it also and needs it, I burnt the first one out that had no heat sink.

Pete

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SPYDER

posted on 15/7/20 at 01:30 PM Reply With Quote
I fitted a small 12V fan from a computer to the rectifier as well as an extra heatsink.
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steve m

posted on 15/7/20 at 01:38 PM Reply With Quote
I seem to remember my rectifiers on my old Suzuki Gt250, and Norton Commando, getting VERY hot

And I definitely changed a couple of them on various bikes I had around 40 years ago

On motorbikes, they were normally in the airflow to allow cooling,

I am no expert, so could be talking absolute tosh, but

If the battery is flat, then the alternator has to work harder, and so will the rectifier, as it converts AC to DC, and will get hot
But if you start with a fully charged battery, the alternator can only replace the lost charge in the battery, hence the rectifier will only be working when the battery need more charge ????

Starterman on here would be the best person to ask,


steve





Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at




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CosKev3

posted on 15/7/20 at 01:53 PM Reply With Quote
As above ideally wants to be sat somewhere it's getting airflow over it,hence the cooling fins on them to get rid of the heat.
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starterman

posted on 15/7/20 at 05:07 PM Reply With Quote
A flat battery is your issue. The rectifier is having to work flat out from the word go.
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steve m

posted on 15/7/20 at 05:36 PM Reply With Quote
I knew I was right, and my best mate saves the day







Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at




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LBMEFM

posted on 16/7/20 at 06:50 AM Reply With Quote
Thank you for the replies
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40inches

posted on 16/7/20 at 08:55 AM Reply With Quote
I fitted a cheap PC fan on mine, it was also mounted onto an ally bulkhead.
Bulkhead wiring
Bulkhead wiring

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