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No Charging, light off in RUN, light on in ACCESSORY [message #322065]

Mon, 14 August 2017 10:48

DetroitDan

Messages: 51
Registered: March 2017
Location: Taylor, MI

Karma:

Member

Every few days, I take the Chief out for about 15 miles - Up and down the freeway -- to see what breaks. When I finally get it ready to camp most of the running bugs should be swatted.

Last night, the coughed and died a couple of blocks from home. The battery voltage dropped below the Pertronix module's ignition level.

To get it home, I fired up the Honda and jumped the systems.

Here's what I found:

Engine running at the stock isolator:

Nothing worth counting (~0 VDC)at the alternator terminal on the isolator (Random, spurious voltages due to the high-impedance DMM)
12.6 VDC at the house side
10.8 at the chassis side

The GENERATOR light:
Illuminates in the ACCESSORY position
Does not illuminate in the RUN position (engine running or not)

I might not have tine to look at it today, but as I eat my lunch, looking at the schematic, here are my guesses:

1) The exciter wire lost connection with the alternator.

OR

2) The field or (field connection)in the alternator is open.

Here is my reasoning:

The generator is not charging because the field is not excited.

The GENERATOR indicator illuminates in ACCESSORY, because the ACCESSORY feed to the bulb is ground seeking through the bulb (and resistor) to un-powered loads connected to IGNITION 1.

The GENERATOR indicator does not illuminate in RUN, because, without the field load, the ACCESSORY and IGNITION 1 feeds are at the same potential. So, no current flows through the bulb (and resistor).

I ask those of you with more experience, other ideas?

I'll post what I find, but it may be a few days.

Dan Wallace
Detroit Metro
1974 Canyon Lands 260
Headers, 3.55, 16"
Floor plan 26-9
Honda 6010
Harrison 4-bag

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[Message index]

		No Charging, light off in RUN, light on in ACCESSORY By: DetroitDan on Mon, 14 August 2017 10:48
		Re: [GMCnet] No Charging, light off in RUN, light on in ACCESSORY By: Mr ERFisher on Mon, 14 August 2017 10:54
		Re: No Charging, light off in RUN, light on in ACCESSORY By: DetroitDan on Mon, 14 August 2017 11:02
		Re: No Charging, light off in RUN, light on in ACCESSORY By: roy1 on Mon, 14 August 2017 11:08
		Re: No Charging, light off in RUN, light on in ACCESSORY By: Ken Burton on Mon, 14 August 2017 11:07
		Re: No Charging, light off in RUN, light on in ACCESSORY By: JohnL455 on Mon, 14 August 2017 11:34
		Re: No Charging, light off in RUN, light on in ACCESSORY By: jhbridges on Mon, 14 August 2017 12:47
		SOLVED - No Charging, light off in RUN, light on in ACCESSORY - No Field. By: DetroitDan on Tue, 15 August 2017 10:32
		Re: [GMCnet] SOLVED - No Charging, light off in RUN, light on in ACCESSORY - No Field. By: James Hupy on Tue, 15 August 2017 10:42

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