JELF ALERT W/ Issues !!

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George N Lake Ozark
Posts: 324
Joined: Sun Jan 06, 2019 2:15 pm
First Name: George P
Last Name: Clipner
* REQUIRED* Type and Year of Model Ts owned: Late '26 Touring
Location: LakeOzark,Missourah
MTFCI Number: 18665

JELF ALERT W/ Issues !!

Post by George N Lake Ozark » Tue Sep 14, 2021 2:09 pm

Steve is on his way back to Kansas, no side trips this time. Having maybe some trouble with his Regan type magneto charging system using 1156 bulb. Normally when engine is shut down bulb turns off. This time the bulb remains on at shut down. He has unplugged the bulb so nothing runs down.
Question: What’s going on here ??
Steve is currently in Springfield Ill Walmart parking lot.
Recombinations wanted. I’m in touch with him by phone.


Alden
Posts: 16
Joined: Tue Jun 22, 2021 10:06 am
First Name: Bob
Last Name: Smith
* REQUIRED* Type and Year of Model Ts owned: 1922 Touring
Location: Troy, NH
MTFCA Number: 51258

Re: JELF ALERT W/ Issues !!

Post by Alden » Tue Sep 14, 2021 2:20 pm

If the diode fails shorted then the diode acts like a short circuit in both directions. My guess it failed?

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paulmikeska
Posts: 45
Joined: Mon Jan 07, 2019 10:20 am
First Name: Paul
Last Name: Mikeska
* REQUIRED* Type and Year of Model Ts owned: 1914 Touring, 1917 Speedster, 1923 Farm Truck, 1926 Coupe
Location: Arvada CO
MTFCA Number: 15976

Re: JELF ALERT W/ Issues !!

Post by paulmikeska » Tue Sep 14, 2021 2:27 pm

I agree with Alden.
Diodes normally fail closed. So the battery is back feeding through the bulb and diode through the mag coils to ground.

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Topic author
George N Lake Ozark
Posts: 324
Joined: Sun Jan 06, 2019 2:15 pm
First Name: George P
Last Name: Clipner
* REQUIRED* Type and Year of Model Ts owned: Late '26 Touring
Location: LakeOzark,Missourah
MTFCI Number: 18665

Re: JELF ALERT W/ Issues !!

Post by George N Lake Ozark » Tue Sep 14, 2021 2:48 pm

Thanks just relayed to Steve. He’ll leave the bulb out for now. He’s checking other wires too his engine isn’t running as smooth as he thinks it should.


TXGOAT2
Posts: 6411
Joined: Sun Feb 14, 2021 10:08 pm
First Name: Pat
Last Name: McNallen
* REQUIRED* Type and Year of Model Ts owned: 1926-7 roadster
Location: Graham, Texas
MTFCA Number: 51486
Board Member Since: 2021

Re: JELF ALERT W/ Issues !!

Post by TXGOAT2 » Tue Sep 14, 2021 3:05 pm

Running two diodes in series would protect against failure in either one. I don't know if the bulb would pass enough current to de- magnetize the magneto.


Norman Kling
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First Name: Norman
Last Name: Kling
Location: Alpine California

Re: JELF ALERT W/ Issues !!

Post by Norman Kling » Tue Sep 14, 2021 4:12 pm

If the diode is shorted, the magneto will alternately charge and discharge the battery, so it would be better to disconnect it and charge the battery before he starts out and each day until he gets home. Do not drive with lights on and crank start if possible to extend the battery charge life.
Norm

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WayneJ
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First Name: Wayne
Last Name: Jorgensen
* REQUIRED* Type and Year of Model Ts owned: 1915 Runabout, 1918 Runabout
Location: Batavia, IL
MTFCA Number: 31697
MTFCI Number: 23399
Board Member Since: 2013

Re: JELF ALERT W/ Issues !!

Post by WayneJ » Tue Sep 14, 2021 5:23 pm

I believe the bulb will also stay lit if the battery is hooked up backwards.
Wayne Jorgensen, Batavia, IL
1915 Runabout
1918 Runabout

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TRDxB2
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First Name: Frank
Last Name: Brandi
* REQUIRED* Type and Year of Model Ts owned: Speedster (1919 w 1926)
Location: Moline IL
Board Member Since: 2018

Re: JELF ALERT W/ Issues !!

Post by TRDxB2 » Tue Sep 14, 2021 9:29 pm

If need be I can get to him, 3 hr drive not problem. But what to bring?
The past is a great place and I don't want to erase it or to regret it, but I don't want to be its prisoner either.
Mick Jagger

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