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Post by ponchokel on Sept 14, 2015 21:01:05 GMT -5
Hi all. This more directed to "Mr. Mersy"...I finally installed a relay switch to my accessory pusher radiator fan. All seems to be working OK, but I want to make sure I have it wired correctly.
Using 40 Amp Relay (4 Prongs)
Relay Switch "87" prong wired to direct Fan power source. Fan ground wire to car frame.
Relay Switch "85" prong to ground on frame of car.
Relay Switch "86" prong to manual Toggle Switch in Car. Toggle Switch to ground, Fuse source power and to fan accessory. (IGN) fuse source in my case.
Relay Switch "30" prong to 30 amp in-line fuse to Positive on Battery.
Please let me know if I have this correct? Thank you...
After reading the dangers of not having a relay to my fan as well "Mercy" kicking my butt about it I now understand how IMPORTANT Relay Switches are required.
Now to just figure out hooking ones into the head lights for better and safer power. :-)
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Post by henrystoys on Sept 14, 2015 22:13:39 GMT -5
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Post by henrystoys on Sept 14, 2015 22:23:10 GMT -5
I know you asked Mersy directly but I'm giving my 5 cents( no more 2 cents) Using 40 Amp Relay (4 Prongs) These two terminals power the fan Relay Switch "87" prong wired to direct Fan power source. Relay Switch "30" prong to 30 amp in-line fuse to Positive on Battery. This pair of terminals are what controls the fan on/ off Relay Switch "85" prong to ground on frame of car. Relay Switch "86" prong to manual Toggle Switch in Car from a fused source power, (IGN) fuse source in my case.
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Post by MERSEY on Sept 14, 2015 23:24:14 GMT -5
Kel.....I believe you're using a 40A Changeover Relay (if you're using the relay you showed me previously). If that's correct you've got 5 contacts as opposed to the 4 that Henry mentioned. However, 4 contacts is all you'll be using.
30 – Fused High Power - Input [Blue]
** Use minimum 12Ga wire (fused or cct breaker - 30A)
** My recommendation is to use your horn relay (which is a primary power distribution point on these old GM's) for the power source instead of your positive terminal on the battery. In this configuration your alternator will step up output more quickly to meet the fan's requirements as opposed to pulling the power from the battery which will not trigger the alternator to step up output until it drops below 13V. 85 – Relay Coil - Ground [White]
86 – Relay Coil Feed “Trigger” [Black]
87 – High Power Output “Normal-Open” [Yellow]
** Connect high or low beam, electric fan or other accessory
87A – High Power Output “Normal-Closed” [Red] **Not required in your application.
The colors I've noted are the pigtail colors on your relay.
Looks like you've got things under control. Congratulations on eliminating that fire-trap wiring configuration you previously had for your fan.
Mersey
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Post by ponchokel on Sept 14, 2015 23:26:46 GMT -5
Thank you very much Henry, this is great stuff. I will read up and study.
Anyone can answer this, I just wanted Mersy to know I finally am taking his good advise. :-)
So I got it right???
The headlights will be next on my list. I also want to add an extra fuse box for a couple of things, but still a novice with this wiring stuff. I have all the components.
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Post by ponchokel on Sept 14, 2015 23:31:54 GMT -5
Relay Switch set up.bmp (511.38 KB) I used this diagram for my guide. Wow Thanks too Mersey, I will study what you just sent too. Thanks a million..I think I am good, but the tip for horn connection I will check that out. I bought a new 4 prong relay just for the fan. The pigtails I got long ago will be for the headlights. Yes I understand on a 5 prong you sometimes don't need that extra one depending on what your application is. Yes using 12 g wires and 14 g, no worries. Shielded connectors, little bit of wire black goop and a heat shrink sleeve around any bare connections. I even shrink wrap the end of connector to the wire a bit after crimped to ensure a strong hold as well color coded so I don't frack it up...LOL I think I will just set up everything for the headlights, then when I see one of you...you can just guide me to which wire plugs in were. I will see how it goes... YES Not using relays for these types of things is Definitely a Big NO, NO...I am lucky I never caught on Fire!!!! DOH!!!
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Post by Pressedham on Sept 15, 2015 9:39:40 GMT -5
I have always wired my fans direct to a toggle on the dash. Over 210 on under off Never have had any problems.
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Post by MERSEY on Sept 15, 2015 18:34:40 GMT -5
I have always wired my fans direct to a toggle on the dash. Over 210 on under off Never have had any problems. You're lucky you haven't had any problems. This is the same claim Ricky-Bobby made when I told him he should have his fan hooked up via a relay. He said he'd never used any relay and he'd never had a problem.......Then one day on his way back from a car show in Malone, he was crossing the Prescott bridge when he caught a whiff of electrical smoke and saw some smoke curling out from under the dash. Luckily he quickly realized it must be the toggle switch for his fan so he yanked the wires off it. When he got across the bridge he pulled over and checked things out.....his toggle switch was melted as well as the wires connected to it. Later in the week he was happy to show me his new wiring configuration for his fan.....it included a relay. Electric fans draw a lot of current. Therefore, it's wise to use a dash mounted toggle as a low power trigger for a relay, not a high current pass through to an accessory like a fan. The relay should be located close to the fan and the power source should be a main power distribution point and not the positive post of the battery.
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Post by ponchokel on Sept 18, 2015 22:12:32 GMT -5
Yep other than what Mersey is saying, I did some home work on this subject and it scared the crap out of me. Now wired correctly all is great, and the voltage needle barely moves when I turn on the Fan. I also now know where to hook up for power through the horn, so doing that next for a more tidy looking set up.
Henry checked out my installation this evening after cruise night and gave me the Thumbs Up...Thanks Henry...:-) Thanks Too Mersey for staying on my case about it too, I am lucky I never caught myself on "Fire". I am sold on relays now, that's for sure.
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Post by MERSEY on Sept 19, 2015 20:09:02 GMT -5
If you get bored Kel there are a number of excellent articles on madelectrical.comI read and re-read most of the articles and found them very helpful. Of particular interest was one comparing 1-wire and 3-wire alternators. BTW......good job on fixing up that fan wiring.
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Post by ponchokel on Sept 21, 2015 20:22:26 GMT -5
Hey Thanks, yes I have been reviewing them intensely for the past couple of years. I misplaced the one about direct wire to "HEI" to fuse box ign, can't seem to find it anymore? I think I have a copy of it on another old PC, just to find it...LOL...somehing I want to do for a long time, as I have my bypassed on that old brown wire, but never seems to have been an issue, but maybe it is??? Gotta to get to it.
BTW, hooked power for fan relay source to "Red" terminal on horn box...Works Great. Fused of course. Now just to tidy up the wires a bit better.
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