High Current Draw - Potential ECM
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6th Gear
Joined: May 2021
Posts: 11
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From: Michigan
High Current Draw - Potential ECM
Hello, I am new to this forum and hopefully can get some insight on my problem. I have had a battery drain issue on 2017 Street glide Special when ignition off, I used a multimeter and measured 1.1 amp draw which is excessively high, it cycles on and off every second and sends power to amp, radio, accy plug. I disconnected everything Meaning amp, head unit, gauges, etc.. one at time and measured current draw, the only time current draw returned to normal around 6-10 milli amps is when I disconnected the ECM center gray connector. So I am assuming I have a bad ECM, I also checked wiring and cannot find any shorts, ground issues. The bike runs fine, just drains battery when ignition off. My question is does my diagnosis sound correct? Also I know the BCM tells the ECM what to do, so could it be the BCM? When I unplug BCM the issue goes away also,but that I believe cuts power to everything. I am getting the B2102 DTC, which is System Power output shorted high. I ordered a new ECM and was going to install and see if it works without turning on bike, then have it flashed at the dealer to marry it to the BCM if it worked. Any advice would be greatly appreciated.
Seasoned HDF Member
Joined: Sep 2009
Posts: 17,145
Likes: 6,168
From: SE Michigan
Hello, I am new to this forum and hopefully can get some insight on my problem. I have had a battery drain issue on 2017 Street glide Special when ignition off, I used a multimeter and measured 1.1 amp draw which is excessively high, it cycles on and off every second and sends power to amp, radio, accy plug. I disconnected everything Meaning amp, head unit, gauges, etc.. one at time and measured current draw, the only time current draw returned to normal around 6-10 milli amps is when I disconnected the ECM center gray connector. So I am assuming I have a bad ECM, I also checked wiring and cannot find any shorts, ground issues. The bike runs fine, just drains battery when ignition off. My question is does my diagnosis sound correct? Also I know the BCM tells the ECM what to do, so could it be the BCM? When I unplug BCM the issue goes away also,but that I believe cuts power to everything. I am getting the B2102 DTC, which is System Power output shorted high. I ordered a new ECM and was going to install and see if it works without turning on bike, then have it flashed at the dealer to marry it to the BCM if it worked. Any advice would be greatly appreciated.
Seasoned HDF Member
Joined: Apr 2015
Posts: 10,058
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The only thing I can suggest is try pulling fuses (5A Battery, 20A Radio, 20A P&A, 10A Cooling) one at a time and check for amp draw.
If you have security, you might want to disable that first before pulling fuses.
That's all I got.
If you have security, you might want to disable that first before pulling fuses.
That's all I got.
Seasoned HDF Member
Joined: May 2012
Posts: 32,934
Likes: 36,031
From: Carlsbad, CA
There is a 7.5A fusesystem power. Thats how the ECM & BCM get power. Pull that and see if its the same.
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Thread Starter
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6th Gear
Joined: May 2021
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From: Michigan
Thanks, yes did that, even when I pull the 50amp main fuse, this stops current to the accy power outlet, but still get current to the amp etc... I had an ex tech come over and look at it and he was baffled, he said try ECM also, but yes based on what I researched seems rare an ECM goes bad, just out of all other options!
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Seasoned HDF Member
Joined: May 2012
Posts: 32,934
Likes: 36,031
From: Carlsbad, CA
Thanks, yes did that, even when I pull the 50amp main fuse, this stops current to the accy power outlet, but still get current to the amp etc... I had an ex tech come over and look at it and he was baffled, he said try ECM also, but yes based on what I researched seems rare an ECM goes bad, just out of all other options!
The 50A cuts power to everything that isnt connected directly to the battery.
The 7A cuts power to the ECM & BCM.