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david-b 08-06-2011 08:00 AM

75 Monte ran fine, now nothing
 
Hey all;
Yesterday was the first time taking the Monte out for some cruise nights. Thing has been running great, nicely tuned and been awesome lately. I get on the street, about 2 blocks away from the garage and in some traffic. I gave her some gas to try to get over at some point and she just straight died. I throw to neutral and try to crank and nothing happens. I coast her off the street to a side street and popped hood. Everything looks fine.

Long story short, figure out I had absolutely no power. Battery is fully charged (tested it) and all connections from it look fine and solid. I have no lights, no horn, no cranking, straight up no power at all. I checked fuses under the dash and those are all good. All grounds are good as well.

Any ideas on why nothing is working? I would expect the horn to work at least... and got nothing. I'm headed over little later to give it a quick look, but honestly stumped.
Thanks

lt1silverhawk 08-06-2011 08:09 AM

While I am assuming you have already check it, I will still suggest you check the battery terminals. I have experienced the no-cranking, no power to anything before and it turned out to be a bad or loose terminal. The looked fine, but when I messed around with them, was when I found out there was a problem.

I will admit that I'm not sure if my suggestion relates to the car turning off suddenly though.

By the way, do you have an electric fuel pump?

david-b 08-06-2011 08:13 AM

The negative terminal was a wee-tad loose when I checked it. However, I haven't touched the terminals in about 2 weeks, and car has had no problems before. But even after tightening them up, there was no change. I will clean the terminals later, but the battery is brand new, and the wires have been cleaned not too long ago.

FP is mechanical

lt1silverhawk 08-06-2011 08:20 AM

Ok, keep us posted. Hopefully other members with chime in soon with better ideas. I was reading over your earlier threads and it seems like you have had to do alot of work with the wires on this car.

david-b 08-06-2011 08:31 AM

Quote:

Originally Posted by lt1silverhawk
Ok, keep us posted. Hopefully other members with chime in soon with better ideas. I was reading over your earlier threads and it seems like you have had to do alot of work with the wires on this car.

Ya electrical was a nightmare when I bought it. But once I had it figured out, haven't had any issues since until now.
Thanks for helping though! Really appreciate it. Anyone else got any ideas?

helrazr3 08-06-2011 08:44 AM

sounds like you popped a fuseable link. trace the wires to the solenoid and see if you have a reading. if you follow them you should see a tag that says fuseable link

FmrStrtracer 08-06-2011 08:48 AM

Is your car equipped with a fuseable link at the starter?

Positive cable goes to starter, then a wire with the fuseable link feeds off the main starter terminal to supply the rest of the car with power. If the fuseable link goes bad, no power to car. Test for power at starter.
do you have a chassis service manual(as used by the dealership), it will have complete wiring diagrams.

david-b 08-06-2011 08:57 AM

Quote:

Originally Posted by FmrStrtracer
Is your car equipped with a fuseable link at the starter?

Positive cable goes to starter, then a wire with the fuseable link feeds off the main starter terminal to supply the rest of the car with power. If the fuseable link goes bad, no power to car. Test for power at starter.
do you have a chassis service manual(as used by the dealership), it will have complete wiring diagrams.

I have a Haynes book... will check in that. Would that link be inside the car or the engine bay? Or vaires?

helrazr3 08-06-2011 09:02 AM

its in the wire that goes from the battery to the starter. it should be easy to trace. there may be more than one but they will be right in the area of the battery

david-b 08-06-2011 09:08 AM

Quote:

Originally Posted by helrazr3
its in the wire that goes from the battery to the starter. it should be easy to trace. there may be more than one but they will be right in the area of the battery

Ok I'll check that out. I know that wire from Positive to starter is a very thick and braided-looking wire. Like its wrapped with almost header wrap.

helrazr3 08-06-2011 09:25 AM

the positive cable itself is very thick but you will also see a smaller wire along with it thats the one you want to look at

FmrStrtracer 08-06-2011 11:05 AM

Haynes manuals usually dont have wiring diagrams, you have to get the factory service manual printed by GM or Helms, check ebay.

On 70's GM cars, the fusable link is located by the starter solonoid on top of the starter, not by the battery.

david-b 08-06-2011 11:53 AM

I'm out here working right now... I have 12v everywhere at battery, at alternator, at voltage regulator... seems pretty good in the bay. Not sure what wires to check under the dash though. All fuses under there are good. Still nothing at all working.

helrazr3 08-06-2011 12:09 PM

go under the car and check at the starter solenoid for 12 volts. and follow the small wire attatched to the positive bat cable and check the other end for 12 volts. do the headlights come on?

HalfOunce 08-06-2011 12:28 PM

At the big post on the starter you will have the battery wire as well as 2-3 red 10gauge wires the last 4 inches will be fuse link, also terminating at that same post. one or more of those fuse links are burned out. you can get the fusable link wire at the part store, do NOT solder these back in,only crimp. The red wires other end will terminate at various places, one being the back of alt, another at the blower relay, and another at the fuse box.


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