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Old 07-29-2021, 10:06 PM   #1
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Default 1986 D21 Instrument cluster electrical problems

1986 D21 V6 heavy duty long bed. My problems started when the battery was connected backwards. Fried the main fusible link. Ended up replacing the ECU and having the fuel injectors rebuilt to get the truck running again. The alternator was bad, replaced. I have checked all fuses and links multiple times. Now most things on the instrument cluster are not working. What works: headlights high/low, high beam light on dash, running lights, emergency flashers lights and arrows on dash but the switch is temperamental, dash light dimmer rheostat. What doesn't work: gas gauge, temp gauge, turn signals, low oil pressure, emergency brake light and the charging light is on but the new alternator is charging - check with multi meter. Any help or suggestions would be appreciated.
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Old 07-29-2021, 10:32 PM   #2
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There is a fuse that does the dash. My truck blows it when the reverse lights come on with a trailer plugged in. I don't remember which one but it isn't marked as such.



Is your voltage regulator functional?
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Old 07-30-2021, 12:18 AM   #3
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Subscribing.

I'm also curious about (i.e. suspect) the instrument cluster fuse.
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Old 07-30-2021, 12:15 PM   #4
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This recently happened to me. Cluster stopped working. Checked all the fuses with a tester, good. Then I pulled the fuses and rechecked them with my eyes, found it. It was a 10amp fuse blown.
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Old 07-31-2021, 05:28 AM   #5
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I’ll recheck all the fuses. Thanks
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Old 08-01-2021, 07:37 PM   #6
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Checked all the fuses/fusible links and still no luck. Not sure what to check or what to do next.. Is there another fuse panel other than the one by the drives side door?

Last edited by robm; 08-22-2021 at 01:57 PM.
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Old 08-01-2021, 08:49 PM   #7
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Under the hood, near the battery... I think. Got the Factory Service Manual (FSM) yet?
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Quote:
Originally Posted by Deerhurst
What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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Old 08-06-2021, 04:22 PM   #8
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Trying to find the right Factory Service Manual (FSM). I can find one for 1989 but not 1986. If any one has one please let me know. Thx
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Old 08-06-2021, 04:48 PM   #9
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Quote:
Originally Posted by robm View Post
Trying to find the right Factory Service Manual (FSM). I can find one for 1989 but not 1986. If any one has one please let me know. Thx
Correct. The 1989 is as close as you will find unless you buy a paper copy. The only difference between the 1986.5 and the 1989 is the section on the codes. The 1986 used an early version of codes whereas the 1989 used OBD1.

There is a link in my signature below that goes into depths on reading codes. It has a small section on the 1986.5 codes that was provided by Deerhurst.
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Old 08-12-2021, 07:56 PM   #10
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Hey homie I have almost the exact same issue except my flashers don't work either. Muffler shop jumped my 1988 funny when I left it there to get a new O2 welded. Go on the Nico club website and get the 1989 FSM, it's close enough. Not much info out there but I'm suspecting it's some of the diodes behind the drivers side kick panel.

All my relays are good and my fuses are all hot, it's something weird that fried just after the fuse box. Blinkers, hazards, gauge cluster (aka "combo meter" in the FSM) all gang thru the hazard and combo switches so it's worth testing and cleaning those too, mine were gummy and ancient so just replaced them outright.
here is my thread with same prob and a few diagrams.
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