Tally TransAm

iTrader: (17)

popped another fuse after only 20 miles today with the wideband disconnected

i gotta retrace the wires and look for a short or something because this didnt give me any **** for the first 1500 miles and i have since popped 3 fuses in 5 days so something else has to be going on. if i cant find anything im gonna wire in some relays from the battery.

cold weather sucks

vipvegas

iTrader: (13)

Relays are the only way to go on the fans. Here is the relay I used, ran 10 gauge power off relay, to inline 40 amp maxi fuse. Mine runs great. Im running the big ford taurus 4500cfm fan so it should work in your app. Its a Tyco 75amp relay 4 wire about 15-18 bucks

HUNTER02SS

iTrader: (24)

You need to install a relay!!! A relay will take of this problem for you. Like another person said, use 2 to be safe, most relays come in 30amp.

koolaid_kid

iTrader: (21)

One thing to keep in mind when sizing a relay. The Bosch-style relays have 2 ratings, 87a (powered when OFF) is usually 40 Amps, 87 (powered when ON, which is what we normally use) is usually 30 Amps. Just thought I'd mention it.

Tally TransAm

iTrader: (17)

Not gonna lie I'm not very good when it comes to wiring. I would need one 4 pin relay per fan correct? 1 pin from the batt, 1 pin from the fan trigger, 1 pin to the fan itself, and 1 pin to ground?.?. Is that correct?

How would I wire up these the retain factory style function? I can obviously figure out the power from the batt and to the fan, but the fan triggers and grounds confuse me with the factory three relay setup

Thanks for the help guys, I appreciate it.

XtremeDime

iTrader: (16)

You can ground to wherever you have metal for the ground, just need to grind away a little paint and screw an eyelet in. Im not sure which color the wires are on the ECM that act as triggers for the phone though. I have a wirirng diagram at home for our cars but Im at work right now. lol

Tally TransAm

iTrader: (17)

here is the fan wiring diagram.

where are you guys installing the relay(s) in order to retain factory fan operation with two aftermarket fans?

98Camarod

iTrader: (43)

I found out tonight that when I turn on my fog lights it doubles as a kill switch. I'm guessing I need a new alternator because when I turned them off and started the car I was fine.

Tally TransAm

iTrader: (17)

bumping this up.

so after doing as much figuring out as i can, the only way i can see to add relays and maintain factory fan operation is to basically remake the factory style three relay setup. i would have to tap into the dark blue and dark green wires from the pcm for the fan signal, and pull power from the battery. being that the fans draw 23 amps a piece, i would just use a 50 amp fuse through one wire or two 25 amps through separate wires.

which leads me to my next question. i am barely exceeding the 40 amp fuse. rather than remaking the entire factory style relay setup, is the factory wiring up to just throwing a 50 amp in there and letting it ride?

fwiw i have been driving around at night to break the clutch in cause its 25 degrees outside and theres no traffic so i never have to stop, but im pretty much done with the clutch break in so i wanna take care of this

stevieturbo

What does the ecu do with the fans thats so special that this is complicated ?

Tally TransAm

iTrader: (17)

ecu doesnt do anything special, i would just like to retain ecu control and having the two fan low speed and two fan high speed operation.

unless im picturing it wrong, if i wire in two four prong relays, one before each fan, there wont be a low speed function because with the relays trip even for low speed it will just get full juice from the battery and run on high speed

like i said im ok but not great with wiring but i cant see where im supposed to add a relay to the stock setup

stevieturbo

Cant really see much point in fitting high power fans, only to want them to run at low speed ?

If the water gets too hot, fan comes on. When it cools, it goes off.


Keep it simple.

Lonnies Performance

iTrader: (16)

The problem is not the running current daw, buy the higher inrush current as the fan starts & comes up to speed. That current can be double what the running current is. To prevent blowing fuses, use a "slow blow" fuse. It will withstand overcurrent for a few seconds while the fan spools up without blowing.

koolrayz

iTrader: (26)

I use the same fan. They EACH draw 23 amps. You are going to blow 40 amp fuses. I use a relay and a 40 amp fuse for EACH fan. I use the signal from the PCM to trigger the relay.

Tally TransAm

iTrader: (17)

ok wtf

i got two 30amp relays and wired them into the fans.

30 = batt
87 = fans
86 = dark blue high speed fan signal
87 = ground

and now i have no fans!!!

i can put 12v to pin 86 and the fan comes on but now i cant get it to come on from the pcm


ARGGG!!!!!

stevieturbo

Ever wonder what pin 85 might be for ?

Tally TransAm

iTrader: (17)

typo, 85 = ground

like i said i know the relays are right cause if i hit pin 86 with 12v they come on. im guessing im doing something wrong with the pcm signal

BadgeZ28

iTrader: (28)

I bought an after market fan controller with variable adjustment. That triggers a relay for each fan. I am just using cheap in line fuse holders for the old 1 1/4" by 1/4" glass fuses.

FRUSTRATED T/A

iTrader: (13)

as already stated, make sure both fans dont come on at the same time. They will draw more juice when first started. I dont remmber if the stock relays activat off a power or ground signal. ill have a look at my pcm diagram later.

stevieturbo

Its rare for the ecu to supply anything other than grounds for switching devices. Naturally I assume you tested the ecu's output though ?