need help with charging.

[rudyyloverboiii]

all new wiring in a 64c20. Truck needs to be jumped in order to turn on. Alternator had it checked twice at the auto store and it passed. Have got two new batteries. New starter. New voltage regulator. Cant seem to find the problem i know that our trucks have ground issues. Anyone else have this problem? Or perhaps any advice? Thanks!

[aerotruk63]

The headlights come on in the run position? Without the jumper cables?

You connect the jumper cables directly to the battery or the positive to the positive terminal and then the negative to the block?

[franken]

If it cranks slow forget the alternator and regulator. They haven't got a thing to do with starting the engine.
What's the battery voltage when at rest and when cranking?
The - cable should run from the battery to the block.
If it clicks or does nothing, look at the low current + side from the battery to the cab and back to the engine.

Without a voltmeter and taking measurements, you know nothing. New wiring doesn't mean good wiring, nor does is mean wired correctly.

[Captainfab]

With the engine running, you should have 13.8-14.2 volts at the post on the alternator as well as at the battery.

[RBW]

What does it do when you try starting it without a jump? Does it do nothing? Click at the starter? Turn over slowly? Turn over normally but not start?

[rudyyloverboiii]

Have not checked the volts on alternator nor battery.
When trying to start without jumping it does nothing. My windshield wipers barely come on. Then completely die after like 3 seconds. It doesn't even click or turn over.

[RBW]

If you've tried this with two fresh batteries and neither are delivering full voltage to the electrical system, I'd say start troubleshooting be checking the battery cables and terminals on both ends of each cable.

[Ghernandez66]

check your grounds . I had the same problem at some point it was a bad ground wire from battery to block.

[rudyyloverboiii]

Ok cool thanks I will do that. Do you guys mind showing me where the best grounds to put in the engine bay area?

[Ghernandez66]

Originally Posted by rudyyloverboiii

Ok cool thanks I will do that. Do you guys mind showing me where the best grounds to put in the engine bay area?

I have mine connected to the alternator bracket and also one from the block to the frame any open threads on the block I think should work just clean them up and use sandpaper to get down to clean/bare metal to achieve a good ground

[rudyyloverboiii]

Ok cool. Im gonna do one to the alt bracket as well. I have one from the block to the frame.

[vince1]

When I got my truck the only way it would start was with a screwdriver at the starter. PO had changed the wiring to the switch and once I put that back to original it was good.

[rudyyloverboiii]

mine was the same way vince. I got a new ignition switch and still nothing so i jumped my starter into an off on toggle switch and that is how i turn it on now.

[LVPhotos]

Going out on a limb... is there a wire off the starter with a fuseable link? Seems to be the number one pain in butt. If the voltage drop is around 10v that's most likely it.

[jchav62]

Touch the horn relay to see if it's hot. Those are notorious for going bad and draining the battery.

[rudyyloverboiii]

LVPhotos
Re: need help with charging.
Going out on a limb... is there a wire off the starter with a fuseable link? Seems to be the number one pain in butt. If the voltage drop is around 10v that's most likely it.

no there is none and i still havent been able to check the volts since i dont own a reader.

Originally Posted by jchav62

Touch the horn relay to see if it's hot. Those are notorious for going bad and draining the battery.

Ok thnak you. Yesterday i did notice the whole relay came out of the silver lining. The relay if about 2 years old

[rudyyloverboiii]

So I finally had a chance to charge my battery n test it on Friday. Checked it Saturday morning 12.81. Checked the alternator n 12.90. Disconnected my air ride compressor. Checked it today on Monday n 12.81 bat n 12.90 alt n fired right up. When running the reading dropped....thought it was suppose to go up?

[Ghernandez66]

Truck off 12v it's ok truck on 13.5-14v that's what I look for