1973 - 1979 F-100 & Larger F-Series TrucksDiscuss the Dentsides Ford Truck
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Just wanted to say hey all!! Been a while, got busy with work and such lol! Thanks for the comments, about the 20's, yea I'm not a real fan but my son likes em so they have kinda grown on me. And for the price... what the heck. lol
Anyway, been driving it daily and just aquired a new issue. Dang brand new battery keeps going down in a few days. Put new cables on her too. Any ideas??
Outside of a deffective battery, the easiest way to look for a short that's draining the battery is to disconect the + cable at the battery. Put a voltmeter inline, any current draw will make it show battery voltage. Pull fuses untill it shows no draw (0.0V), that will be the circuit to investigate. Fortunately '73's don't have too many fuses.
Two things, be sure EVERYTHING is "off" including courtesy/dome light. And, after pulling all the fuses, there is still a current draw have the alternator checked.
BTW, your truck looks pretty nice.
Wanted to say thanks Mike and Grubb, will do this today and let you know what I find. She's been trouble free for a while and I figured it was just a matter of time before something came up. Not that it breaks down all the time but I'm slowly getting the old parts out of her one at a time..lol Thanks again you guys
Another thing to check is the charging system. When the engine is running, there should be right at 14V at the battery, or it won't actually keep it charged. Even 100A @ 12V will not maintain the battery charge.
The way you said the battery goes down every few days leaves out 1 detail. If it is not started/driven during this time, then it sounds like a parasitic draw. If it is started/driven daily, but the battery goes down after a few days, weak charging system is more likely.
Just 1 of the many reasons I hate the factory "alt" gauge Ford used. A simple volt meter would be far more informative. And more likely to work......
1980 F-150 300 I6, C6 & 9" rearend. Cummins 5.9L/ NV4500 5 speed swap in the works
1974 F100 Ranger XLT 390, C6 3.25 axle. Dad bought it new.
1983 Mazda RX7 1.1L Rotary.
1984 CRX 35 MPG go kart
1995 Mazda B2300 (undercover Ford)
Well it's been several months and have enjoyed driving the 73 for the summer. I parked the old girl in the garage this November and there she has sat, well I can't help it but I have to start tweaking again. I'll once again start posting pics as I have the motor pulled and down at the machine shop, gonna put a little sumtin in the ol' 390 to give her some kick.( Have a parts list I have been working on a while now) While I have it out I was met head on with the old rusted floor pans, rusted front cab mounts, and a few holes in the firewall to boot. Gonna seize the moment to repair the rust in the cab so I'll be posting again. Sorry it's been so long but life calls you know. I have enjoyed all the help, advise, and encouragement from everyone on this site!!
awesome build! My 73 was also purchased off the showroom by my grandpa, still have the original sales brochure. Now on its third generation and someday I will pass it on to the fourth. Great looking truck, keep up the good work!
Thanks KMAC, yea the sentimental alue alone makes this truck priceless. I let my 16yo son drive it to school part of the year until he got dinged in the parking lot... lol So we got him another vehicle to drive, didn't need anymore work on my hands than I already have. Got the block and crank to the machine shop, looks like the block will go .30 over, crank was fine with a polish. Have a few photos to post but just haven't had time to get em up yet.
wanted to keep things somewhat up to date. So, pulled the motor out and started putting a little sumptin in it..lol Wow, Ford had a hodge podge of parts in the short block assembly that had me confused for a bit but we got it figured out. For a motor that had never been apart she was dirty for 78K miles. Due to the odd piston configuration ford threw in it I figure compression was 7.5:1 at best..... WTF???? Here are a few photos of that process along with an idea of what I'm up against for body work... whew... gonna hafta burn the midnight oil, that is if mother nature decides to let spring in the door.
Thought I would touch on Ford's fantastic motor combination they sold my grandfather new off the showroom in 73. All the paperwork shows it's a 390ci, for the most part that's the truth, the block is indeed a 390 however the casting number on the crank was that of a 428. After checking the stroke it turned out to be a 390, all we could figure is that they turned a raw forging to 390... Had me scratching my head because a 428 is an externally balanced crank that really looks nothing like a 390 and there were no counterweights on the flywheel. So, next we checked the rods...yup 390.... Then the pistons...Uh, not even close... They were stamped 410 on the skirt, the pin height was off and the piston if you look in the photo didn't even come close to the deck. I was told that during those years Ford was going through a changeover and was throwing things together to dump parts. Fact is that with those pistons they were nowhere even close to 9.0:1 compression.... can you say DOG!!! So ordered a nice set of flat tops that put me at 9.5:1, a respectable street motor is on the horizon. Added a Lunati vodoo hyd. cam 268/276 @ 50 110 degree ls cam with all the springs and such. Will be putting a 2400rpm stall in the tranny to make it all work. Think I have a solid street combination after a ton of research. Will start assembling the short block this week so more photos to come.
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