The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Electrical

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 02-16-2019, 03:13 PM   #1
b79holmes
Registered User
 
Join Date: Sep 2016
Location: Acton, MA
Posts: 19
'90 V1500 something shorted out

Hi all,
A few days ago, I replaced my alternator and completely forgot to disconnect the battery. It seems something blew. It looks like I don't have power to any of the 'always on' circuits. Only the brake lights and hazards will work with the ignition off. None of the interior lights work at all, headlights don't work and no horn.

With the ignition on, the radio speakers will make static but the controls/display won't work, the wipers work, turn signals work, parking brake warning light/seatbelt light work, and the blower motor works. If I try and start it, it will crank all day long but it shows no sign of firing. I haven't yet checked if this is because of no fuel or spark. The check engine light will not come on at all, even if I put in my code reader.

I have checked the two fusible links by the starter, the two that come off the firewall junction, and the one by the alternator. The ohmmeter shows current can flow through all of them, and the firewall junction did register 12 volts on the multimeter. The connection between the alternator and the battery, and the battery to all of the nearby grounds are solid.

So what else am I missing that could cause these symptoms?
b79holmes is offline   Reply With Quote
Old 02-18-2019, 06:07 PM   #2
b79holmes
Registered User
 
Join Date: Sep 2016
Location: Acton, MA
Posts: 19
Re: '90 V1500 something shorted out

UPDATE:
I got the truck to run off a bottle. It fired right up but ran real rough so I didn't keep feeding it for long.

This means I know know that the fuel pump, ecm, radio, horn, and anything that runs off the headlight switch is not getting power. None of the fuses are blown. Is there any single circuit which controls all of this? Do they all share some common ground cable? Any thoughts would be greatly appreciated.
b79holmes is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:43 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com