88 sportster 1200 not charging please help
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4th Gear
Joined: Apr 2018
Posts: 8
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From: New Hampshire
88 sportster 1200 not charging please help
I bought this 88 sportster 1200 that i was told stop running one day, the electronic ignition sensor was blown out, I replaced with a dynatek igniton sensor, I have put a new battery in it. after getting a new battery and finally riding i found it the battery is not charging. While running the battery stays the same voltage. I have tested the stator lead connector and am getting a low reading of 13 AC volts around 1500 RPM and it does increase with engine speed to over 20-25 AC volts, from what I read this is a low reading and should be from 14-20 AC volts per 1000 RPM. I have disconnected the Regulator and found the back with the epoxy was cracked and a big burn mark in it. I have replaced the Regulator now and make sure all connections to battery, regulator and main circuit breaker are clean and tight still not charging. I assume the previous owner had a problem and maybe the whole bike was fried? although it did start and run after replacing igniton sensor and battery. does anybody know what I should be looking for now? I would think that even if the stator is putting out AC volts and with a new regulator and verified battery is good that i should get a charge? Thanks for input
Road Warrior
Joined: Jul 2012
Posts: 1,566
Likes: 55
From: Londonderry, NH
I bought this 88 sportster 1200 that i was told stop running one day, the electronic ignition sensor was blown out, I replaced with a dynatek igniton sensor, I have put a new battery in it. after getting a new battery and finally riding i found it the battery is not charging. While running the battery stays the same voltage. I have tested the stator lead connector and am getting a low reading of 13 AC volts around 1500 RPM and it does increase with engine speed to over 20-25 AC volts, from what I read this is a low reading and should be from 14-20 AC volts per 1000 RPM. I have disconnected the Regulator and found the back with the epoxy was cracked and a big burn mark in it. I have replaced the Regulator now and make sure all connections to battery, regulator and main circuit breaker are clean and tight still not charging. I assume the previous owner had a problem and maybe the whole bike was fried? although it did start and run after replacing igniton sensor and battery. does anybody know what I should be looking for now? I would think that even if the stator is putting out AC volts and with a new regulator and verified battery is good that i should get a charge? Thanks for input
What is the voltage regulator output?
Your problem should be in the charging circuit (voltage regulator/stator).
The bike started and ran on the battery until it discharged...so look again at the charging circuit.
Thread Starter
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4th Gear
Joined: Apr 2018
Posts: 8
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From: New Hampshire
I have done all basic testing and everything passes so far but when bike is running voltage doesn't change where do I look now?
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No resistance means a reading of 0.0 ohms. Are you saying you have 0.0 ohms between the plugs and 0.0 ohms from the plugs to ground? If so, that's a fail.
Readings from Stator plug to ground must be OL
As noted above - read the stickies.
Readings from Stator plug to ground must be OL
As noted above - read the stickies.
Last edited by Ed Ramberger; May 4, 2018 at 03:14 PM.
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Thread Starter
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4th Gear
Joined: Apr 2018
Posts: 8
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From: New Hampshire
My voltmeter ohm scale reads 1 until it picks up any reading so when I touch the probes together there is a reading. When I use it to test it stays at 1 on my meter which I believe on my meter means no resistance or infinite. I always tried with the audible ohm test and get no sound. If I touch the probes together it beeps