#101  
Old 10-10-2019, 10:17 AM
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Quote:
Originally Posted by "QUICK-SILVER" View Post
OP's car has dual electric fans. The MAD amendment doesn't cover what happens in the event of alternator failure and you have to drive home on the battery. Better carry spare wire and spare fusible link with you every where you go. That would include tools needed and an assortment of wire terminals/connectors.

Needs wired so the battery takes the spike from fans kicking on. Instead of the alternator going into overtime evey time the fans come on. Same for headlights. I'd want the power supply for them on the B+ side of the remote solenoid. And would want adequate guage wire from alt output to that same solenoid lug.

Just not good with some of MAD's thinking
Clay
Well MAD does show a 2 fan setup, but regardless, unless you have a PWM controller, it's still going to take a hit. You just use 2 relays.

A good way to pad the power spike is with a stereo cap, it works. But you should still run a PWM controller. That spike not only can damage the battery, it will also take out alt regulators.

Headlights are not as much of a spike as fans are, and usually not anything to be concerned about. Unless of course you are running HiD, or maybe high output Halogens.

If you have twin fans and your alt goes bad, you're not going to make it very far with or without the fans. So a jumper wire is pointless, the batt will drain within a few mins. Especially at night. Basically what will happen is you're driving, and then notice lights are getting dim, you pull over, and that's it. You won't even be able to start it without a jump. And even then, once you pull the jumper cables, it will most likely just die, especially with an electronic dizzy.

If you're running a AMG type battery, when the alt goes bad, either a full charge or an 'off' type failure, it damages a cell. You generally only have 6. And there's no fixing it once a cell is damaged. Without one or two cells, it just won't charge all the way, or it will show an error on the charger (hopefully you are using a smart charger with an AMG or dry cell batt). But if it's 3 cells, you turn the engine off, it most likely not have enough power to start. And running a batt with a bad cell or two can also take out alt regulators.


EDIT: Basically, once you see the light on the dash go on, you're done. You use that time to get to a safe pull off area, and call a truck.


.

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  #102  
Old 10-11-2019, 12:00 AM
wbnapier wbnapier is offline
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May I ask what / where is my common post?

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1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
  #103  
Old 10-11-2019, 08:29 AM
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It's one you created when you followed the MAD example. (red arrow in attached diagram)


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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be
  #104  
Old 10-13-2019, 09:41 AM
wbnapier wbnapier is offline
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HWYSTR455,

Regarding getting my dash battery light to work with a one-wire alternator and the Mad Electrical set up, I relocated the red wire ring terminal from the alternator output post to the common post (primary junction block), but the engine still had run on when I turned off the key.
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1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
  #105  
Old 10-13-2019, 10:58 AM
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You probably need to install a diode. Your alternator wiring instructions from MAD should've had that. I don't remember, but can find the info if you don't find it.

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  #106  
Old 10-13-2019, 12:30 PM
"QUICK-SILVER" "QUICK-SILVER" is online now
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Quote:
Originally Posted by wbnapier View Post
"A" - Is the brown wire that goes to #9 engine harness bulkhead connector. I think that goes to the external voltage regulator that I am not using, so I can try to make a terminal for that.
Brown wire that went to the old voltage regulator is for the GEN/ALT light.

This wire should go to terminal #1 on the new alternator.

With MSD box, this light wire will need a diode to stop the run-on problem.

Page #8 here in MSD instructions.
https://www.jegs.com/InstallationIns...1/121-6420.pdf

Clay

  #107  
Old 10-14-2019, 08:57 AM
wbnapier wbnapier is offline
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Scott 65,

Yes, Mad included instructions, but they applied to 3 wire alternators. I will double check.

I have a diode. I am unsure where to install it with the minnie wire harness.

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1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"

Last edited by wbnapier; 10-14-2019 at 09:06 AM.
  #108  
Old 10-14-2019, 09:09 AM
wbnapier wbnapier is offline
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Quick Silver,

Please see the attached image. Do you think I can run a wire from the GM style 12SI terminal #1 shown in the image to the gen/alt brown wire? With a diode or no diode? Same gauge as the brown wire?
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__________________
1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
  #109  
Old 10-14-2019, 09:21 AM
"QUICK-SILVER" "QUICK-SILVER" is online now
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Quote:
Originally Posted by wbnapier View Post
Quick Silver,

Please see the attached image. Do you think I can run a wire from the GM style 12SI terminal #1 shown in the image to the gen/alt brown wire? With a diode or no diode? Same gauge as the brown wire?
Yes you can and put the diode anywhere you want to. The diode has to be there to stop the run-on.

If you don't have the brown wire hooked to anything now...We need to try and figure out what's causing the run-on now. That's before you hook the brown wire up.

Clay

  #110  
Old 10-14-2019, 09:42 AM
wbnapier wbnapier is offline
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Quick Silver,

I have no run on, unless I try to hook up the PowerMaster 150 harness, which was supposed to make the charge indicator light function per the image below.

So, I am good for driving the car... I just want to see if I could get the dash light working.
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__________________
1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
  #111  
Old 10-14-2019, 09:52 AM
"QUICK-SILVER" "QUICK-SILVER" is online now
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Just adding the diode should fix you right up.

Terminal #1 is hot when the alternator is turning/charging. This had no affect on factory ignition systems. Diode stops the feed back that goes through the charge bulb and back to the ignition switch. It's not much volts/amps but it is enough to trip the on/off relay built inside the MSD box.

Clay

  #112  
Old 10-14-2019, 10:01 AM
wbnapier wbnapier is offline
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So, running a single wire from that 1 terminal, with an inline diode, to the brown wire on the 4 terminal external regulator harness will do the trick? The diode installed so no current flows to that brown wire?

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1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
  #113  
Old 10-14-2019, 10:18 AM
"QUICK-SILVER" "QUICK-SILVER" is online now
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Yes that is it. The diode just stops current from going back through the bulb.

Key off cuts battery power off. Feed back through the bulb wire keeps IGN-1 hot as long as the alternator is turning/charging. Once the engine stops nothings wrong. No shorts, no battery draw, not anything.

"pretty much" just something that happens when you use a MSD box.

Terminal one in the alternator goes to ground when the alternator isn't charging. That's what turns the bulb on when the alternator isn't charging. So the one way diode lets the bulb still work like factory. Just stops the back feed that's enough to trip the MSD's internal relay.

Clay

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