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Unread 05-23-2015, 08:35 PM   #1
Evesdropper
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1984 CJ8 
 
Join Date: Dec 2011
Location: Omaha, Ne
Posts: 4
2.5l diode placement question

1984 Scrambler w/2.5l

Installing HEI and wired with a relay according to JeepHammer's diagrams. I am getting the back feed voltage from the alternator that keeps the jeep running after the key is turned off.

I have the diodes but my alternator plug has three wires however instead of the two mentioned in all the posts. (1) 10 gauge red and (2) 18 gauged brown
  • Red wire goes to the starter solenoid battery power stud
  • One brown wire is spliced into the heavy gauge power wires coming out of the firewall on the driver side.
  • One brown wire is goes to a silver box on passenger fender by the starter solenoid. no idea what it is

Which wire gets the diode?

The only other wires are heavy ones that are on a stud on the back of the alternator.

Fuzzy phone picture of the connector and wires.
Thanks.

img_1305.jpg  
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Unread 05-24-2015, 08:58 PM   #2
Evesdropper
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1984 CJ8 
 
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Location: Omaha, Ne
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anyone?
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Unread 05-25-2015, 05:30 AM   #3
Mike Romain
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Quote:
Originally Posted by Evesdropper View Post
anyone?
Most only have the one small brown wire tagged to the ignition power that can back feed so the diode goes there.
I have never heard if this extra box you seem to have. Photo?
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Unread 05-26-2015, 01:18 PM   #4
Evesdropper
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Location: Omaha, Ne
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Here is a photo of the box I was talking about.
img_1306-small-.jpg

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Unread 05-26-2015, 01:31 PM   #5
Fourtrail
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1974 CJ6 
 
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Location: Illinois
Posts: 325
Sounds like a standard GM 3 wire alt. That silver box looks like a relay that should cut the power to the brown wire when the key is shut off. This will also stop the back feed of any voltage from the alt. It is possible that it is wired wrong and power is still getting back fed after the key is shut off. Can you unbolt it and turn it over so we can see how it is wired up?
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Unread 05-26-2015, 02:04 PM   #6
Evesdropper
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1984 CJ8 
 
Join Date: Dec 2011
Location: Omaha, Ne
Posts: 4
I will unplug the wires and report back tonight on how it goes. Here are pictures of the alternator and how the relay is wired.
img_1307-small-.jpg

img_1308-small-.jpg

img_1309-small-.jpg

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