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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: TimTyler on August 04, 2013, 08:23:47 PM

Title: K75 Necessary Base Amps
Post by: TimTyler on August 04, 2013, 08:23:47 PM

How many amps does a bare bones K75 require from the alternator to run without draining the battery?

I'm trying to calculate how close I am to reaching the 32 amp limit my alternator can provide using know values from the lighting and accessories I have on my bike.

Fortunately my accessory lighting is LED (4 amp total) but I've also got a couple of USB draws and occasionally a 5 amp heated vest.

Title: Re: K75 Necessary Base Amps
Post by: motodude on August 05, 2013, 12:49:02 AM

Hi Tim,

I don't have any hard numbers or anything.  But on my '90 K75, with the same 35w alternator, I could run both my vest and (factory) electric grips simultaneously for hours without any noticeable problems with the battery.

Tom

Title: Re: K75 Necessary Base Amps
Post by: Grim on August 05, 2013, 09:38:34 AM

The bulbs would be easy to do the math on. It's the pump and engine management components you need to figure out.

Got a VOM? Many can handle a 10amp draw on the current settings. On my bike the power going to the fues box is on a separate lead then the power for the starter so you shouldn't have a problem hooking it up. I'd say 10amp would be plenty to run the bike and lights.

Title: Re: K75 Necessary Base Amps
Post by: TimTyler on August 06, 2013, 10:31:00 AM

Thanks. It sounds like I probably don't have anything to worry about.

Title: Re: K75 Necessary Base Amps
Post by: Thorfinn on August 07, 2013, 07:13:35 PM

..Certainly nothing on a USB cable is liable to cause you any concern. Very little current draw is even possible on that protocol. In general, K-bikes have simply oodles of electrical capacity compared to Airheads. Worry not, old bean. :euro