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Old 05-03-2010, 06:59 PM
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no power after engine install

i just put a new motor in a 1982 gmc pickup. i went to start the truck and i dont have power to anything lights, horn, etc. the battery is fine and i checked and i am getting power to the starter. everything worked with the old motor in and once i dropped the new one in nothing works. i checked the ground from the negative batt cable and that is good also. if anyone has any suggestions i would greatly appreciate it.

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Old 05-03-2010, 07:16 PM
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is the ground from the back of the engine to the body there?
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Old 05-03-2010, 07:51 PM
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i never had a ground on the back of the engine. i didnt wire the truck after i bought it i started finding alot of things he did wrong thats why i had to put a new motor in. i know the ground from the battery cables good im thinking it is a ground somwere. this truck has been the biggest pain every time i fix one problem i find atleast one more.
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Old 05-03-2010, 08:34 PM
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Va4cqd had a good point, check your grounds. I usually run one to the block, from the block to firewall, and one to the frame,or radiator core support. Ken
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Old 05-03-2010, 09:07 PM
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there would have been a ground from block to cab from the factory.
how do you know the ground is good from the battery to the engine?
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Old 05-03-2010, 09:17 PM
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Tomorrow I will look to see what other grounds there are thanks for the help whAt is a good way to see if I'm getting a good ground.
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Old 05-03-2010, 10:11 PM
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Quote:
Originally Posted by rk0982
Tomorrow I will look to see what other grounds there are thanks for the help whAt is a good way to see if I'm getting a good ground.
Tightly attached terminals to the cables and no paint between the cable ends and the block, firewall, chassis or whatever the attachment point is.

Stay away from those cheesy clamp-on replacement battery cable terminals. They may look and feel good and tight, and still have a poor connection that will draw a lot of current. They're junk, plain and simple.

Use quality 'factory' crimped/attached terminals and cables that are large- like 2 gage between the battery and engine block. They aren't cheap, but are a basic requirement for a hassle-free charging and electrical system. Then use a large gage cable between the engine and chassis and to the firewall and radiator support as well. I use both terminals of a top/side mount battery to ground my Malibu, it gives an extra attachment point for a ground to the chassis or in my case, the rad. support.

Last edited by cobalt327; 05-04-2010 at 05:48 AM.
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Old 05-04-2010, 12:59 AM
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did you check to see if that power accesory block that bolts onto your firewall is in good shape? mine did the same thing when the connection went bad, lost all power driving down the road.
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Old 05-04-2010, 10:29 AM
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i just checked the truck again and i get power to the starter but i dont get power anywere else. it is like a dont even have a battery in there i have no lights or horn etc. its probaly something simple but i cant find out what it is. the starter is a rebuilt one that worked on the old motor and it is not very old. does anyone have any more suggestions on why i only have power to the starter and no where else
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Old 05-04-2010, 04:05 PM
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i am able to use a screwdriver and jump the starter were the motor will turn over but i still dont get any power to anything in the truck. is there a way i can check the fusible link that runs from the starter up to the alternator? I think the fusible link might be the problem but id like to test it before i replace it. thanks
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Old 05-04-2010, 04:47 PM
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check for voltage with a multimeter at the output stud of the alternator.
this might be a stupid question, but is the fusible links that feed the trucks electrical system hooked up?
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Old 05-04-2010, 09:36 PM
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i will check that tomorrow. i have triple checked to make sure everything is hooked up. hopefully i can get it figured out soon.
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