Denso 90A alternator - IG amp draw
#3173173
09/05/23 04:47 PM
09/05/23 04:47 PM
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Joined: May 2019
Posts: 17 Chicago area
Magnum GT
OP
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OP
member
Joined: May 2019
Posts: 17
Chicago area
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Hello,
Does anyone know the amp draw on the IG wire (12V key on) for the Denso 90A alternator? I've searched the net and can't find any conclusive number.
Thank you,
Steve
Steve
1979 Magnum GT 2011 1500
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Re: Denso 90A alternator - IG amp draw
[Re: Cab_Burge]
#3173358
09/06/23 02:00 PM
09/06/23 02:00 PM
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Joined: May 2019
Posts: 17 Chicago area
Magnum GT
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OP
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Joined: May 2019
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Chicago area
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Thank you everyone.
Cab-That will be a while. Drivetrain is out of the car and I'm laying out the wiring plans for the EFI, ignition, in tank pump and Denso conversion.
What am I doing....
Steve
1979 Magnum GT 2011 1500
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Re: Denso 90A alternator - IG amp draw
[Re: AndyF]
#3173588
09/07/23 02:46 PM
09/07/23 02:46 PM
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Joined: May 2019
Posts: 17 Chicago area
Magnum GT
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OP
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Chicago area
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Thanks Andy, good idea. I looked at some schematics and although the wire gauge wasn't indicated, I did find a few that show a 7.5A fuse in the ignition line. I took a look at your website for the 90A alternator install instructions and I see what you mean regarding small wire gauge on the pigtail connector.
Steve
1979 Magnum GT 2011 1500
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Re: Denso 90A alternator - IG amp draw
[Re: Sniper]
#3174228
09/10/23 02:39 PM
09/10/23 02:39 PM
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Joined: Jan 2021
Posts: 1,016 rust belt
Moparite
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super stock
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Does anyone know the amp draw on the IG wire (12V key on) for the Denso 90A alternator? Maybe I don't, IG wire? Ignition wire? The alternator had nothing to do with the draw of the ignition. A amp probe will tell you the draw on any wire. [video:youtube] https://www.youtube.com/watch?app=desktop&v=VNZgm0hatzU[/video]
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Re: Denso 90A alternator - IG amp draw
[Re: Moparite]
#3174238
09/10/23 03:41 PM
09/10/23 03:41 PM
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Joined: May 2019
Posts: 6,330 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,330
nowhere
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Does anyone know the amp draw on the IG wire (12V key on) for the Denso 90A alternator? Maybe I don't, IG wire? Ignition wire? The alternator had nothing to do with the draw of the ignition. A amp probe will tell you the draw on any wire. [video:youtube] https://www.youtube.com/watch?app=desktop&v=VNZgm0hatzU[/video] What feeds the (usually) blue wire that connects to one of the field terminals? The ignition circuit. The other field terminal connects to the regulator green (usually) wire.
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Re: Denso 90A alternator - IG amp draw
[Re: Sniper]
#3174408
09/11/23 01:16 PM
09/11/23 01:16 PM
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Joined: Jan 2021
Posts: 1,016 rust belt
Moparite
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super stock
Joined: Jan 2021
Posts: 1,016
rust belt
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What feeds the (usually) blue wire that connects to one of the field terminals?
The ignition circuit. The other field terminal connects to the regulator green (usually) wire. Blue wire(one going to the regulator) is battery power(key on), The green is the way the regulator "regulates" the alternator output. This is relatively low amperage and the regulator varies voltage to the field to control output.
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Re: Denso 90A alternator - IG amp draw
[Re: Moparite]
#3174500
09/11/23 05:22 PM
09/11/23 05:22 PM
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Joined: May 2019
Posts: 6,330 nowhere
Sniper
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master
Joined: May 2019
Posts: 6,330
nowhere
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What feeds the (usually) blue wire that connects to one of the field terminals?
The ignition circuit. The other field terminal connects to the regulator green (usually) wire. Blue wire(one going to the regulator) is battery power(key on), The green is the way the regulator "regulates" the alternator output. This is relatively low amperage and the regulator varies voltage to the field to control output. The blue wire is the IGNITION ONE circuit. That's how the factory labeled it, that's how the OP referred to it. You can call it a ham sandwich if you want, but no one's going to have it for lunch.
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Re: Denso 90A alternator - IG amp draw
[Re: 360view]
#3175237
09/14/23 07:40 PM
09/14/23 07:40 PM
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Joined: May 2019
Posts: 6,330 nowhere
Sniper
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master
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Good link.
So the “IG” wire on Denso alternators only has to carry enough current to “bias on” a transistor switch inside the Regulator IC Chip - probably a low current. Only if it's an internally regulated alternator though, which may or may not apply to the OP's alternator because Denso made both styles.
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Re: Denso 90A alternator - IG amp draw
[Re: Magnum GT]
#3175276
09/15/23 12:12 AM
09/15/23 12:12 AM
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Joined: Aug 2003
Posts: 43,315 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,315
Bend,OR USA
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Thank you everyone.
Cab-That will be a while. Drivetrain is out of the car and I'm laying out the wiring plans for the EFI, ignition, in tank pump and Denso conversion.
What am I doing.... Me too, on two cars under construction, one drag race (150.00+ MPH 1/4 mile, 130 MPH in the 1/8 mile) only and the other street only
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Denso 90A alternator - IG amp draw
[Re: Sniper]
#3175310
09/15/23 09:12 AM
09/15/23 09:12 AM
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Joined: May 2019
Posts: 17 Chicago area
Magnum GT
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Joined: May 2019
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Yes, 90A alternator, internally regulated. AndyF's (AR Engineering) conversion.
Steve
1979 Magnum GT 2011 1500
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