97 7.3 blowing 50 amp maxi #17 - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 12 (permalink) Old 03-23-2017, 11:18 PM Thread Starter
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97 7.3 blowing 50 amp maxi #17

Hi everyone,
I have a 97 that keeps blowing the #17 50 amp maxi under the hood. I have also been getting a cam pos circuit failure. I pulled the engine harness from the truck and visually checked every inch of wiring as well as the lighting harness so everything under the hood. I found a nick in one of the cam sensor wires and replaced the plug. The cam error still exists and i can not find anything shorting. what could be blowing that fuse? an alternator issue? I have a regulated return fuel system so therefore no fuel bowl heater.
Thanks for any suggestions

- Ben
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post #2 of 12 (permalink) Old 03-23-2017, 11:47 PM Thread Starter
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Re: 97 7.3 blowing 50 amp maxi #17

The truck seems to idle fine but when i start driving around, the fuse will blow within 2 minutes
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post #3 of 12 (permalink) Old 03-24-2017, 12:06 AM
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Re: 97 7.3 blowing 50 amp maxi #17

Here is what that fuse controls:

Generator Charge Indicator, Instrument Cluster. See Fuses 2, 3, 6, 11 and 17 (IP Fuse Panel) and Maxi-Fuse 22. Also See Circuit Breaker 12

Maxi-Fuse #22 controls:

Fuel Line Heater, 215 Amp Generator/Voltage Regulator, PCM Power Relay Coil, Glow Plug Controller

So you have your work cut out for you to eliminate what is causing the problem

96 F250 XLT 4x4, 4:10 gears, 5 speed, Tymar intake and HX hose, downpipe, pyro and boost guages, coolant filter, Luc clutch
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post #4 of 12 (permalink) Old 03-24-2017, 12:31 AM Thread Starter
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Re: 97 7.3 blowing 50 amp maxi #17

if it was anything off 22 wouldnt the 30 amp blown? and same with the in dash fuses? I checked the wire that feeds fuses 2, 3, 6, 11 and 17, took the harness out of the split loom pulled out the UH fuse box, pulled the fire wall plugs apart. i guess im pulling the dash harness out next, but i got a good resistance reading from fuse 17 to the dash fuse panel. i know its not the wiring to the glow plug relay and i know the realy releases after the glow plug cycle is complete so its not that. I know the wiring to the voltage regulator is good, could the voltage regulator itself cause this? im just hoping for some better ideas than pulling the dash apart.
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post #5 of 12 (permalink) Old 03-24-2017, 12:36 AM
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Re: 97 7.3 blowing 50 amp maxi #17

I'm betting that it is the alternator.

But that is just a guess, I doubt that it is a wire issue.

96 F250 XLT 4x4, 4:10 gears, 5 speed, Tymar intake and HX hose, downpipe, pyro and boost guages, coolant filter, Luc clutch
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post #6 of 12 (permalink) Old 03-24-2017, 12:38 AM
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Re: 97 7.3 blowing 50 amp maxi #17

Under what circumstances does it blow? As soon as you install a fuse? As soon as you turn the key to RUN? After starting the engine? After running for a while? Knowing that might help track it down.

Did you try removing all the fuses referenced above in the interior fuse box?
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post #7 of 12 (permalink) Old 03-24-2017, 03:14 PM
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Re: 97 7.3 blowing 50 amp maxi #17

Had a ranger recently that blew 50 amp maxi fuse....turned out the alternator had a dead short inside, hookup the big black/orange wire = BOOM maxi fuse toast.
New alternator = fixed.

Something to check

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post #8 of 12 (permalink) Old 04-14-2017, 01:20 AM Thread Starter
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Re: 97 7.3 blowing 50 amp maxi #17

I swapped out the alternator with a spare I had. tested the old one and found nothing wrong. With the new one in the truck it seemed to solve the problem. Today I pulled the truck out of the shop after a about a week of sitting and made it 30 feet down the road before it blew the fuse again. im pulling my hair out any suggestions?
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post #9 of 12 (permalink) Old 04-14-2017, 02:53 AM
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Re: 97 7.3 blowing 50 amp maxi #17

Repeat - Did you try removing all the fuses referenced above in the interior fuse box?
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post #10 of 12 (permalink) Old 04-14-2017, 03:06 AM
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Re: 97 7.3 blowing 50 amp maxi #17

Quote:
Originally Posted by Bugman View Post
Here is what that fuse controls:

Generator Charge Indicator, Instrument Cluster. See Fuses 2, 3, 6, 11 and 17 (IP Fuse Panel) and Maxi-Fuse 22. Also See Circuit Breaker 12

Maxi-Fuse #22 controls:

Fuel Line Heater, 215 Amp Generator/Voltage Regulator, PCM Power Relay Coil, Glow Plug Controller

So you have your work cut out for you to eliminate what is causing the problem
Where Bugman mentions "Also See Circuit Breaker 12", it should be Circuit Breaker 14 (Power windows). If you are not blowing Underhood fuse 22, IP Fuse 2, 3. 6, 11 or tripping CB 14 there has to be a short on:
Ignition Switch connector (C269) terminal I1 (R/LG) to UH Fuse 22
Ignition Switch connector (C269) terminal I1 (R/LG) to IP Fuse 17
Ignition Switch connector (C269) terminal I1 (R/LG) to Instrument Cluster connector (C250) terminal 14
Ignition Switch connector (C269) terminal I1 (R/LG) to IP Fuse 3

Ignition Switch connector (C269) terminal A1 (BK/LG) to IP Fuses 2, 6, 11, CB14

UH Fuse 17 Output (Y) to Ignition Switch connector (C269) terminals B1 and B5.

See the attached. Cheers!
Attached Images
File Type: gif 13-11 Pwr Dist.gif (16.3 KB, 2 views)
File Type: gif C269.gif (15.2 KB, 1 views)
File Type: gif C250.gif (16.0 KB, 1 views)

97 F250 SC 4x4, E4OD, 4.10 LS, Basically Stock, Relocated Block Heater Plug, Ext Trans Filter, Tru-Cool Max, I/C Mounted but not Plumbed

SOLD: 94 F350 CC DRW PSD, 5 Speed, 4.10 LS, SBC Con-O, Baldwin Filter, Tymar HPX Hose, 3 DP, Bilsteins, $12 AIC, Coolant Filter, Explorer O/H Console, Trans Temp, Boost, and Pyro, Pedestal Mod, Gutted EBPV
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