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Old 04-10-2021, 11:50 PM   #1
Rockershipete
 
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Default 93 Quest battery and brake lights come on

After 10 minutes the battery and brake warning lights come on and engine runs rough with power loss. Itís pre computer diagnostics so not sure what to look for.

Last edited by Rockershipete; 04-11-2021 at 12:29 AM.
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Old 04-10-2021, 11:56 PM   #2
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Welcome... I'd find the ECU and get the codes from it. If there's an error, this is how you'll find it.
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What he is saying it 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 04-11-2021, 12:25 AM   #3
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Thanks, since there’s no diagnostic plug in on the 93 I’ll have to try looking for the codes on the ECU. Need to locate it. My battery and alternator check out good at OReillys. I’ve been told it could be a ground or fuseable link.
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Old 04-11-2021, 01:08 AM   #4
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This sounds like the alternator is not charging. I’m not familiar with the quest, but the fusible links are located somewhere near the battery in a box. There are 2 that could cause the alternator to fail to charge. Fusible link #3 is 10 amps, fusible link #9 is 120 amps. You can check them with a multimeter. If they are bad you can probably still get them ordered from the dealership.

I’ve seen many times where people have had their alternator “test good” but be bad. It could also be as simple as a loose belt, corrosion and/or loose battery terminals. Let us know what you find
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Old 04-11-2021, 01:57 AM   #5
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Quote:
Originally Posted by Rockershipete View Post
Thanks, since thereís no diagnostic plug in on the 93 Iíll have to try looking for the codes on the ECU. Need to locate it. My battery and alternator check out good at OReillys. Iíve been told it could be a ground or fuseable link.
Yep, pre-OBD. The ECU, on the trucks, is under the passenger seat. Check there?
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What he is saying it 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 04-11-2021, 02:23 AM   #6
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This is unlikely to set any codes. When the battery is dying because it’s not being recharged the vehicle will begin to run horribly before it dies.
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Old 04-11-2021, 03:57 AM   #7
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According to the '94 manual('92-'93 Quest models weren't listed), the harness connector to access the ECM is located near the starter under the hood(looks like the driver side from the photo).

You'll need to short(use a jump wire, paper clip or a piece of similar wire) Pin E30 & F28 for 2 seconds to get into Diagnostic Test Mode to access any stored codes.

Important tip: Be certain that the bulb for the MIL aka Check Engine Light is functional. A burned out bulb won't illuminate the MIL and therefore making you think there aren't any stored or active code(s) present.

Use the link below to access the manual for EF & EC 16 for the location of the Diagnostic Port for Self-Diagnostic retrieval of codes and monitoring of the Heated 02 sensor.

https://www.nicoclub.com/service-man...-1995%2Fec.pdf
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Old 04-26-2021, 01:51 AM   #8
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Default Loose nut

Thanks for all the great replies!e Turns out it was a loose nut (not me) on the inside alternator bolt that I didnít get tight. The belt was also loose. Tightened to 1/2 ď play and the lights went out and performance improved. Thanks again, you guys are great!
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Old 04-26-2021, 01:53 AM   #9
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Got the lights out. It was a loose bolt and loose belt. Thanks all, you guys are great
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Old 04-26-2021, 04:02 AM   #10
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Thanks for letting us know. Keep the ol' beast runnin'..........
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What he is saying it 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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