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Power Stroke Excursions Technical discussion of the Ford Excursion SUV with the Power Stroke diesel.

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post #16 of 19 (permalink) Old 12-14-2018, 01:44 AM
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Good chance your trailer plug is always hot. See if you are getting 12 Volts to the plug when the key is off. Buddy had a trailer that kept draining the battery because he had a inverter that was hooked to the fridge. Look for a extra wire coming of the positive side of either battery and trace it out. Relay could be stuck closed (I have not seen that, but could happen I guess). I had a 99 F350 that did not come with the factory relay plug/ harness. The previous owner just ran a hot wire from battery to trailer plug.
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post #17 of 19 (permalink) Old 12-14-2018, 12:55 PM
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Following along with your suggestions on my ‘99 F250 7.3 trying to determine current drain.
Both batteries disconnected, Fluke set to 300mA scale. Connect meter across + terminal of battery to battery cable. Meter OL. Pull fuse #8 in power distribution box then drain shows 299 mA. The owners guide shows that fuse as Diesel alternator.
?? Where to now.

'99 7.3L SD F250 4X4 manual 6 speed - original.

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post #18 of 19 (permalink) Old 12-14-2018, 01:53 PM
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Well the more I work on this truck . The more bad numbers I get so you can probably disregard my previous message above. Here’s a picture of the meter. Bulk lead to cable+ and red to + post.
Readings: .79 mA and when I pull fuse #6 in PDB it reads .38mA
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'99 7.3L SD F250 4X4 manual 6 speed - original.

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post #19 of 19 (permalink) Old 12-15-2018, 07:15 AM
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Quote:
Originally Posted by sd73man44 View Post
Well the more I work on this truck . The more bad numbers I get so you can probably disregard my previous message above. Here’s a picture of the meter. Bulk lead to cable+ and red to + post.
Readings: .79 mA and when I pull fuse #6 in PDB it reads .38mA

Your meter in the picture is set to amps and is displaying 790mA. 50mA on your meter will read 0.050 in the 10 amp scale.

Also, be sure that you are waiting the requisite 40 minutes after shutting down the truck and breaking any connections to the battery. Not all modules shut down immediately and most notably the battery saver feature in the GEM module / Central Junction Box in your 2000 Excursion. For some perspective note that "generally" a module will draw ~10mA and an incandescent bulb such as a glove box light may draw ~1A. It is also possible (read that as I have discovered this several times over the years) that a harness concern where water has leeched into a poorly sealed splice or a chafed wire that has dirt and moisture at the point where the circuit insulation is worn off CAN create a parasitic drain as these example can leech power.

Lastly, if you suspect a drain is coming from the alternator, the proper way to discern that is to disconnect both the battery cable and the harness connector on the alternator and retest.






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Last edited by ford_doctor; 12-15-2018 at 07:43 AM.
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