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Jul 25, 2017 | 05:26 PM

#16

CountryBumkin

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From: Orlando area

One benefit to the Fusible link is that will take a large "in rush" of current (over its rating) without damage, if it is just for a short time, where a CB or fuse would trip/blow.

Jul 25, 2017 | 08:39 PM

#17

kr98664

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Quote:

Originally Posted by jdavidsmi

Does anyone know where I could find some of the round 4 wire connections, used in this model truck?

This might help:

Automotive Electrical Connector Pigtails, Terminals, Tools and More

Jul 26, 2017 | 08:53 AM

#18

jdavidsmi

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From: Morrison, TN

Thanks for the links I will start looking around for the connectors, the connector issue is with the tail light circuit the PO had installed the trailer light pigtail so close to the connector its now impossible to repair the wiring properly. So I was looking for a new conductor.

Franklin2
You are correct its a voltage regulator not a resistor as I stated earlier.

how do you know if its working properly?

David

Jul 26, 2017 | 12:30 PM

#19

Franklin2

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From: Virginia

Quote:

Originally Posted by jdavidsmi

When it fails, all 3 gauges will not work or they all read low or high or bounce up and down together. It works much like a turnsignal flasher, so you should be able to read a flashing on and off voltage from it.

Jul 26, 2017 | 12:48 PM

#20

clarktech

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I'm a newbie here, so hope it's OK to post to this thread, as I have a similar problem on a '99 F550 7.3L. I'm drawing about 400 mA with key off and doors closed. Pulled fuses until problem disappeared. The faulty circuit was fuse #15, a 5A fuse that protects the GEM and PCM. Any ideas where I go from here?

Jul 26, 2017 | 12:58 PM

#21

CountryBumkin

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From: Orlando area

Quote:

Originally Posted by clarktech

This forum is for trucks from 1980 - 1986. You should post the forum for your model year.

However, since you already posted here, I will say that 400mA does not seem excessive for the PCM. But IDK the max allowable amount.
The PCM will always draw some power (for its "Keep Alive Memory"). If that is the only draw, you should not notice it if your battery (batteries) are in good condition.
If you have an RV or truck that doesn't get used for months at a time, then you probably need a battery disconnect or isolator to protect from extended battery drain.

Jul 27, 2017 | 02:02 PM

#22

Franklin2

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From: Virginia

I use 70ma as a max, some people use 50ma. You will have to shut the doors and wait 40 minutes before checking for drains on the newer trucks. Not kidding, it's in the factory manual.