Why do I keep blowing up starters?

Fairtax4me · 04-25-2022, 05:11 PM

Need to check the output voltage when the engine is running at full RPM. If your voltage regulator is bad it will cook any starter gen you put in it. Should be seeing about 14v or maybe a little more.
A bad regulator or damaged wiring to the regulator can make the generator output over 18v at full speed and that will roast the brushes and cause the commutator bars to melt off the armature.

kmagnuss · 04-26-2022, 09:14 AM

Thanks for the replies. Very helpful.
I think I’m going to get another aftermarket unit and turn the speed back down to 16’ish and see if it can hold up.
As for the voltage regulator I ‘tuned’ it at full throttle on jack stands to about 13.2v (that was as high as I could get it to go).

mikeasis · 04-26-2022, 10:25 AM

Quote:

Originally Posted by kmagnuss

Thanks for the replies. Very helpful.
I think I’m going to get another aftermarket unit and turn the speed back down to 16’ish and see if it can hold up.
As for the voltage regulator I ‘tuned’ it at full throttle on jack stands to about 13.2v (that was as high as I could get it to go).

was this at idle or part throttle? you should be seeing 13.5 to 14.5 at part throttle for proper charging.

kmagnuss · 04-26-2022, 01:15 PM

Full throttle.

04-25-2022, 05:11 PM	#11
Fairtax4me Bonafide Nincompoop Join Date: Dec 2015 Location: Charlottesburg Va Posts: 8,987	Re: Why do I keep blowing up starters? Need to check the output voltage when the engine is running at full RPM. If your voltage regulator is bad it will cook any starter gen you put in it. Should be seeing about 14v or maybe a little more. A bad regulator or damaged wiring to the regulator can make the generator output over 18v at full speed and that will roast the brushes and cause the commutator bars to melt off the armature.

04-26-2022, 09:14 AM	#12
kmagnuss Not Yet Wild Join Date: Nov 2019 Posts: 6	Re: Why do I keep blowing up starters? Thanks for the replies. Very helpful. I think I’m going to get another aftermarket unit and turn the speed back down to 16’ish and see if it can hold up. As for the voltage regulator I ‘tuned’ it at full throttle on jack stands to about 13.2v (that was as high as I could get it to go).
kmagnuss Not Yet Wild Join Date: Nov 2019 Posts: 6

04-26-2022, 01:15 PM	#14
kmagnuss Not Yet Wild Join Date: Nov 2019 Posts: 6	Re: Why do I keep blowing up starters? Full throttle.
kmagnuss Not Yet Wild Join Date: Nov 2019 Posts: 6

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