Rectifier getting really hot

[drewsdown1]

A few weeks ago my rectifier on one of my Motors caught on fire. melting the mounting bracket wire harness and rectifier. since then I purchased a new rectifier mounting bracket and new connector for a wire harness and the new rectifier is getting hot. I swapped that rectifier with the other Motors rectifier and the problem followed the rectifier to the other motor making me think it's a bad rectifier. After the"knock off, I purchased an oem rectifier they sent me the same looking one but different part number and that one is getting hot as well.. Are rectifiers different even though they look the same?

 

[haknslash]

On my motorcycles it was common they get quite warm, hence the need for heatsink fins.

 

[drewsdown1]

On my motorcycles it was common they get quite warm, hence the need for heatsink fins.

On the other motor the rectifier is not hot at all

 

[FSH 210 Sport]

On the other motor the rectifier is not hot at all

Is this rectifier water cooled? If so check the water flow to make sure there is still cooling water flowing to it.

Check the ground on the wiring harness as well.

I also suggest taking voltage readings one motor at a time.

 

[marcham]

Are they water cooled ? Are the output voltages the same for both? Do they have the same power rating?

Are you buying parts from the dealer? There's tons of fakes on ebay and Amazon.... relabelled fakes is a problem in motorcycles as well.

 

[FSH 210 Sport]

Are they water cooled ? Are the output voltages the same for both? Do they have the same power rating?

Are you buying parts from the dealer? There's tons of fakes on ebay and Amazon.... relabelled fakes is a problem in motorcycles as well.

I can only speak for my boat, yes the reg/rec are mounted on a water cooled plate to aid in heat rejection. Output voltages and power ratings should be the same for both engines.

If the parts are made in china you will see a “CE” on it somewhere.

 

[drewsdown1]

Are they water cooled ? Are the output voltages the same for both? Do they have the same power rating?

Are you buying parts from the dealer? There's tons of fakes on ebay and Amazon.... relabelled fakes is a problem in motorcycles as well.

they are not water cooled rectifiers. the 1st replacement was chinese.. but i then bought a oem that they said would work on my boat but it has a different part number.. my next thing im going to do is check the voltages. where exactly am i supposed to take the readings from?? the stator?

 

[ripler]

See my thread, I had a bad battery.

https://jetboaters.net/threads/i-thought-my-voltage-regulator-failed.21995/

 

[marcham]

The stator creates a fixed amount of power, given an RPM. The regulator dissipates any extra unused energy as heat. If the regulator isn't properly sized or is a different type (Mosfet vs scr), it could cause it to heat up excessively.

I might have missed it above, but have you tried swapping the left and right side?

Do you have seperate left and right engine starting batteries? If not, connect only 1 regulator at a time to the battery, do they output the same voltage?

 

[FSH 210 Sport]

See my thread, I had a bad battery.

https://jetboaters.net/threads/i-thought-my-voltage-regulator-failed.21995/

What is the year and model of your jet boat you had the regulator problems on? i know you said the problem was a bad battery but I’m curious as to whether or not the reg / rec was water cooled.

 

[ripler]

What is the year and model of your jet boat you had the regulator problems on? i know you said the problem was a bad battery but I’m curious as to whether or not the reg / rec was water cooled.

It was a 2010 SX210 with the MR1 engines, they were not water cooled.

 

[FSH 210 Sport]

It was a 2010 SX210 with the MR1 engines, they were not water cooled.

Thanks!