Altenator in my 1994 chevy suburban k1500.

Asked by Dec 19, 2014 at 05:31 PM about the 1994 Chevrolet Suburban K1500 4WD

Question type: Maintenance & Repair

Just replaced my altenator with a known good unit. I have a GM code scanner and it
shows no problem.  Put multimeter on battery (engine not running)  and got 12.5 volts.  
Put multimeter between altenator and battery (engine not running) with normal results.  
Started engine and got a voltage drop between the alt and the battery of about 2 - 3
volts.  Amp meter on dashboard still shows in the red at the low end.  I'm at a loss.

7 Answers

8,420

There's no ammeter. unless you have added electrical equipment. Voltage drop is always voltage lost to heat. Voltage drops are the result of passing thru a conductor with a resistance. Air gap, looseness, internally corroded, coated with an insulative substance, dirt, too many washers, non conductive parts, cheese, crackers, what have you ?

8,420

Connect a new wire of your own between the battery and the output on the back of the alternator, full field it. does the voltage increase ?

1 of 1 people found this helpful.
8,420

have you blown fuses, fusible links, inline fuses ?

2 of 2 people found this helpful.
8,420

Is the alternator plug ok? connector is not at fault for the wires that plug in? Did you disconnect anything else and forget perhaps???

1 of 1 people found this helpful.

Thanks Dannyl. You gave me a lot to think about. Will start checking all that you suggested.

18,765

There is something wrong with the wire or connection between the alternator and the battery

Yea. I came to the same conclusion. Even when my GM code scanner showed no problem. I hate trying to trace down electrical problems. Done it in the past though. Guess I'll have to do it again. My thanks to all for your advice.

Your Answer

Add photo

Related Questions

Suburban

Looking for a Used Suburban in your area?

CarGurus has 19,231 nationwide Suburban listings starting at $1,995.

ZIP:

Search Chevrolet Suburban Questions

Chevrolet Suburban Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 1,010
#2 Neal Turner
Neal Turner
Reputation 890
#2 Eric Fritz
Eric Fritz
Reputation 890
View All

Related Models For Sale

Used Chevrolet Tahoe
597 Great Deals out of 32,881 listings starting at $1,500
Used GMC Yukon
424 Great Deals out of 20,393 listings starting at $1,495
Used Ford F-150
2,167 Great Deals out of 195,111 listings starting at $290
Used GMC Suburban
156 listings starting at $1,974

Used Cars For Sale

2017 Chevrolet Suburban For Sale
15 Great Deals out of 10,044 listings starting at $38,842
2016 Chevrolet Suburban For Sale
31 Great Deals out of 1,413 listings starting at $36,200
2015 Chevrolet Suburban For Sale
20 Great Deals out of 1,058 listings starting at $24,995
2014 Chevrolet Suburban For Sale
5 Great Deals out of 415 listings starting at $17,900
2013 Chevrolet Suburban For Sale
23 Great Deals out of 547 listings starting at $14,786

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.