Faster power windows with 2 relays per door (Page 1/3)
Mike Gonzalez APR 26, 09:33 PM
Spent half a day trying to figure this out, so i figured i would share what I found. Running a 12v fused feed direct from the battery to this relay circuit made my windows at least 3 times faster, well worth the time spent. I know you can buy kits for this, but I have a bunch of relays and my car is still apart from the chop so I decided to give it a shot.
1fast2m4 APR 26, 09:46 PM
is it the fact that you have two relays that makes it faster or is it that by adding another relay you have also effectively doubled the gauge of wire for the ground and a portion of the power. I wonder what would happen if you used a single but much larger relay

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1986 SE 3800SC/4t65eHD (12.871@104.96)
HX-40, FrozenBoost I/C, 80lb injectors & E85 Coming soon.....

Mike Gonzalez APR 26, 10:14 PM
Its because the power to run the motor no longer has to got through the switch in the Fiero. Now the switch only has to carry a tiny load to activate a relay and the relay handles all the load.

A single relay wont work, you have to be able to reverse the polarity to the motor for the up/down movement.

[This message has been edited by Mike Gonzalez (edited 04-26-2015).]

1fast2m4 APR 26, 10:25 PM
Oh gotcha.
Gall757 APR 26, 10:30 PM

quote
Originally posted by Mike Gonzalez:

Its because the power to run the motor no longer has to got through the switch in the Fiero. Now the switch only has to carry a tiny load to activate a relay and the relay handles all the load.

A single relay wont work, you have to be able to reverse the polarity to the motor for the up/down movement.




So on your diagram.....the + switch on one relay is the 'up', and the other + switch is 'down'...?
Mike Gonzalez APR 26, 11:05 PM

quote
Originally posted by Gall757:


So on your diagram.....the + switch on one relay is the 'up', and the other + switch is 'down'...?



Yes, thats correct
mmeyer86gt/gtp APR 26, 11:09 PM
or you could install a 530t next to the switches doing the same thing sorry it is a 529t about. your idea is good but it doesnt do one touch down or up.

[This message has been edited by mmeyer86gt/gtp (edited 04-27-2015).]

Mike Gonzalez APR 26, 11:15 PM

quote
Originally posted by mmeyer86gt/gtp:

or you could install a 530t next to the switches doing the same thing



LOL, you're welcome, and no thanks
theogre APR 27, 11:28 AM
Thanks.

Do this at A pillars is allot easier. You don't need to dig into the door. (Your car is in the shop but others can to same at A pillar below the dash.) A pillar you get a better ground too. If you ground in the door then ground path goes thru hinges and latch. Is not a good plan to do that.

Rodney speed up kit should be at A pillar too, not at the switch as directions say.

For others,
You don't need to mod the switches etc. Switch grounds one wire for up or down but relay does not care when the coil gets ground to both terminals.

Problem is based on mainly 3 parts...
  • OE switches wear over time for switch high amps. Switching on and running a motor are bad enough but the stall current can be a lot higher. Stall current is at end of travel before you release the switch and is why GM uses 30a breaker. (Gen2 HL module sees any stall and shut down power to the motor(s) in milliseconds.)
  • Power to Zone 3 "cross car" harness have many other loads, connection, etc. Zone 3 is a sub-harness to Zone 2... Plug in at C200 under dash and is on Fuse Link A that runs most of car. (Zones See my Cave, Wire Reading)
  • Power to Motors goes thru all that. By the time motors get power, you often have Big Voltage Drops... 1V or more. Low Voltage means motors try to pull more Amps to make up the Watts needed. See my Cave, Electric Motors

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    Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
    (Jurassic Park)

    The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)

    • Orig88GT-NC APR 27, 06:23 PM
    I did this MOD several years ago, and the windows did work better...

    I Highly agree with theogre
    quote
    Do this at A pillars is allot easier. You don't need to dig into the door. (Your car is in the shop but others can to same at A pillar below the dash.) A pillar you get a better ground too. If you ground in the door then ground path goes thru hinges and latch. Is not a good plan to do that.


    Something I used that might be of help to anyone else thinking of doing this MOD is a Dual Relay Socket, makes for a cleaner/easier install.... and their only about $3.25

    All Electronics- DUAL SOCKET FOR AUTO RELAY