Charging system circuits

Charging system circuits


Missing-Presumed Wheeling
Lifetime Supporter
Plumas Lake, CA, USA
1974 CJ5 ~ Fresh built AMC 360 - SM420 - D20 - D30F with upgraded 30 spline shafts and knuckles & D44R - 4.27 Gears - ARB Lockers F/R - All chrome molly axles - on 33's - YJ 4" Lift Spring Conversion
Original Thread:

So what apparently happened: (not sure there was ever an issue with the winch...)


If you look, there are two wires coming off the ign coil. Well, when I replaced the coil with DUI distributor and MSD streetfire box, I neglected to re hook up the 2nd wire, that runs back to the "I" post on the starter relay. That "I" post provides voltage into the voltage regulator, which is the back up system for the alternator to get the power it needs to begin to reproduce power and charge battery / run the Jeep while running.

I hooked up a ignition power wire to the "I" post, and the yellow into the voltage regulator, and it charges.

However :cool:..... That is the "back-up" circuit for charging system... from what I have read, the main circuit that should work is the "Alt / Amp indicator light circuit"...

The main circuit is supposed to be the (show on left lower of the above diagram) from Ignition hot (switched) to the fuel gauge, to the alt indicator light (which in my year is the AMP light, but same thing) to the grey wire that appears to connect into the voltage regulator... but this is where it looses me, and I am confused.

It appears the two wires simply come together to then go to the regulator terminal of the Alt.

but the grey (orange actually on the Voltage reg i have, but same thing) is output power, that is already being supplied through the "resistors" and by the back up circuit above.... But unless the light, restricts some voltage, the voltage will be higher than the voltage already coming out of the voltage regulator, and it seems to me this would basically bypass the regulator...


AHHH... Anyways, I am learning about the charging stuff at least :D

What do you guys think?

The charging ALT / AMP bulb does not work anymore, never paid much attention to it, since didn't think was important. Noticed the other day it did come on though, but has since stopped again. Checked bulb its good.

Think I just have a mess of wiring that needs to be cleaned up and re-ran because I suspect I have wiring shorts. Grimlins as most call them.

Hmmm painless wiring harness you say... Hmmm :cool:


~ JR
Bump... :cool:

look into the EZ wire harness. Less $$ and about the same for install ease..

Jeep-CJ Donation Drive

Help support by making a donation.

Help support by making a donation.
This donation drive ends in
Top Bottom
AdBlock Detected

I get it, I'm a Jeep owner and ad-block detectors kinda stink but ads are needed on this site. This is a CJ site, all the ads are set for autos (some times others get through.) I cannot make them just for Jeeps but I try.

Please allow ads as they help keep this site running by offsetting the costs of software and server fees.
Clicking on No Thanks will temporarily disable this message.
I've Disabled AdBlock    No Thanks