truck wont start need help

[4speedburb]

Ok so I just got my burb on the road again, and today I ran into a problem, I shut truck off and when I went to leave, I lost all electronics, (headlights, interior lights, cig lighter) but I still have radio, and when I got to crank it over, it just turns over with no fire, I need help asap as to everything I need to look at.

 

[77 K20]

"On the road again"? What work were you just doing to it?
Is your radio aftermarket? (thinking that stereo shops often wire directly to the battery or battery post)
Off hand I'm thinking you might have blown a fuseable link. There is one that goes to your alternator and then I think there are some after the junction block (might be mounted to the firewall? I forget...). When that goes you lose power to pretty much everything except your starter.

 

[89Suburban]

^^^^This, check first. One at alternator and starter. Use a test light to check for power on the right stud of the power junction block on the firewall.


Posted From Hell

 

[4speedburb]

I just put a ring and pinion in it, yes radio is aftermarket, but I'm the one that out it in a year ago, and idk where these "junction blocks" are I don't understand how it has worked all week then out of nowhere it just stops,

 

[77 K20]

The junction box should be on the firewall between the distributor and brake/master cylinder area. Look for a terminal block with plastic under and around it for insulation.

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I think this is from an older truck- but should give you an idea.

 

[4speedburb]

Ok cool I found it, and how do I go about checking it

 

[77 K20]

Check it with a test light or a multimeter. Need to see if it has 12 volts on it. (power)

 

[4speedburb]

Ok, if it doesn't how will I go about fixing it?

 

[89Suburban]

If it does not light up then you have to follow the thick red wires both to the alternator and the starter. The fusible link will stand out, it is a larger tube shaped section around the red wire. Usually close to the alternator or starter. Sometimes simply wiggling or twisting that part of the wire will momentarily flow power to the cab. Here are a few pics of fusible links so you know what to look for. I actually have one just to the left of the junction block as well.

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[4speedburb]

Ok, how do I check disable links? I found em just not sure how to check them

 

[77 K20]

Ok, how do I check disable links? I found em just not sure how to check them

Use a meter or test light and check on both sides of the link. If both sides have power then it is good. If only one side has power then the link is bad.

Or if you have the battery disconnected you can ohm them out. Put the black lead on one side and the red lead on the other side of the link. It should read around 0 ohms.

Depending on the type of links you have you might need a sharp probe on the lead to stab thru the insulation carefully.... or just know where the wire starts and ends at.

 

[4speedburb]

Ok sweet!! Thank you guys for the help, I need it fixed, and I'm not good with electrical lol

 

[89Suburban]

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