1978 Blazer FWC

brian90744

American Trekker
#16
The blue battery isolator on right fender has 3 termals. the center is for the alternator, the left is to battery. no right is required, unless you have 2 batteries. Just fyi=brian
 
#18
I like the slots. Keep them if you can. They fit the style of the 78 and the camper well.

Getting back to your charging problem, I'm running a similar alternator on my 5.3. Mine is set up to one on 1 wire. But for the life of me I can't remember how I hooked it up. I'll have to look at it tomorrow.
 
#19
While I was working on mine this afternoon I double checked my connector to the alternator. I have 1 circuit going into the plug. The plug has four terminal locations, 1 large and three smaller. The single wire is connected to the first small terminal next to the large terminal. That should be marked as terminal "I" for ign. Your original alternator connector would have had that circuit there, just transfer it to the pigtail for the new alternator and connect it to the correct terminal and it should work.
 
#20
While I was working on mine this afternoon I double checked my connector to the alternator. I have 1 circuit going into the plug. The plug has four terminal locations, 1 large and three smaller. The single wire is connected to the first small terminal next to the large terminal. That should be marked as terminal "I" for ign. Your original alternator connector would have had that circuit there, just transfer it to the pigtail for the new alternator and connect it to the correct terminal and it should work.
Got a pic?
 
#22
I never got around to getting a pic of my plug, but here's one off of the net. My single wire goes into the first small terminal next to the large terminal in this pic. Pretty easy.

 
#23
I never got around to getting a pic of my plug, but here's one off of the net. My single wire goes into the first small terminal next to the large terminal in this pic. Pretty easy.
Thanks for the info. Pretty sure I tried it like that. I've been traveling and haven't been able to look at it. So you only have the one wire? Everything I've read states that I need to connect that large lead on the far left of the image to the alternator output as it's a "sense wire" or excitor. The other wire that will be used is used for the gauges; one for if you have an actual gauge, and the other if you have a indicator light. The only thing I haven't yet tried is actually taking the large red lead and running it directly to the positive side of the battery. Maybe it isn't actually hooked up where I think it is on the other end (I have a hard time contorting myself into a position to see it well, and the headers are right in my way).
 
#25
Pretty sure I got it figured out. The isolator I have has a diode for each battery, so there's no voltage to sense at the back of the alternator output because the electricity only flows one way, therefore the alternator won't charge. If I hook the sense wire directly to the positive side of a battery, it'll charge. Anyway, I already ordered a different isolator; one with jump-start capability, and this isolator is only rated to 120 amps anyway. Nice to figure it out, though and I appreciate your help, Zoomad.
 
#26
Funny story. I'd been searching specifically for a Blazer or Ramcharger/Trailduster with a camper for years; since at least 2012 (though I remember seeing them and thinking it would be nice to have one back in 2009 or so). Anyway, I was looking for some family pictures I had stored on an ancient laptop, and stumbled into a Word document that had some photos I'd saved from Craigslist. The last ad I'd saved on the document was the actual ad placed by the 2nd previous owner. It looks almost exactly like I got it, except it still had it's refrigerator, the cabinet hadn't been modified, it had a different heater, and it had a 5 gallon water tank.

The ad states: "I have a 1978 K 5 blazer for sale. I have owned it for 6 years and it has never let me down. The engine, transmission and transfer case have less than 10k on them. The engine is a 350 with 4 bolt mains. It has an edelbrock intake and carb, Headers, and accel super coil, 4 core radiator, dual battery set up, power steering, power brakes, power windows, and power locks. aM/FM/CD with remote speakers. It has a slide in camper made by Four Wheel Campers. The camper has a gas fridge, two burner stove top, 10 gallon water tank, gas radiant heater. New carpet with pad. 2500 watt inverter and camper battery volt gauge. Tire and wheel combo - 33 x 12.50 with Alcoa aluminum wheels. The transfer case has the part time kit and front lock-out hubs are installed. New springs were just put on before I purchased. I just installed newer seats out of a 1998 Dakota. Now the seats are very comfy and completely adjustable. Huge upgrade over factory seats. Any more questions please call. Motivated seller need to go to new home. Zach"

Here's a few pictures that accompanied the ad in 2012:
SmartSelectImage_2018-06-17-18-34-44-953x696.png SmartSelectImage_2018-06-17-18-36-37-955x706.png SmartSelectImage_2018-06-17-18-35-02-955x704.png