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Post by frankensvo on Feb 21, 2022 14:28:45 GMT -5
I have a 93 LX with a 84 GT350 engine n trans ,I used a MERKUR stand alone harness with T.C ECU, BROWNIES n VAM ,I'm at a fork in the road regarding the fan. Do I just run a key powered wire to the MERKUR fan relay then run the relay ground wire to the 226 degree "which I THINK is to hot" fan switch in the intake "GT350" OR run a wire from the T.C ECU to the MERKUR relay from the #55 FAN DRIVE pin ?..I've wired both pins n if I use the T.C for activation can I hook up a 2nd fan and circuit with 2nd relay activated by the HIGH DRIVE #52 pin or am I better off just running the #55 FAN DRIVE or #52 HIGH DRIVE circuit alone ?...Also what are the temps that the T.C #52 n #55 pins are set to activate the HIGH DRIVE n FAN DRIVE circuits?.....THANX!
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Post by Stinger on Feb 22, 2022 10:59:57 GMT -5
I think they are around 205 and 225 degrees. If you want to change this, just get an aftermarket fan controller that allows you to set the fan temp where you want it (not below 195 since the thermostat opens at 190).
If you don't want to use an aftermarket controller, emulate the factory TC wiring for either (or both) pins.
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Post by frankensvo on Feb 22, 2022 13:09:45 GMT -5
I think they are around 205 and 225 degrees. If you want to change this, just get an aftermarket fan controller that allows you to set the fan temp where you want it (not below 195 since the thermostat opens at 190). If you don't want to use an aftermarket controller, emulate the factory TC wiring for either (or both) pins. I have a 1984 FORD mustang capri electrical & vacuum trouble shooting manual that shows COOLING FAN TEMP SWITCH closed above 226 degrees I have a 200-210 switch I am planning on using. From what I gather so far I can use the LA3 ecu to activate the MERKUR relay if I use pin #55 "or 52 h.d.f pin" with the MERKUR ground left in place but cannot adjust the temp settings.....and if I use the temp switch in the lower intake water jacket I need to move the MERKUR's ground wire to the switch so when the switch closes at 200-210 grounds the ignition charged circuit to activate the fan.... correct ?...THANX! |
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Post by Stinger on Feb 22, 2022 14:00:19 GMT -5
The 87-88 TC didn't use a fan switch, the fans are computer controlled. The fan switches are not connected to the ECU. So pick one way or the other to control the fan(s), not both.
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Post by frankensvo on Feb 22, 2022 20:18:12 GMT -5
I reread my post n see where there can be confusion on my plan...I was not planning on using both, but one or the other ..I guess the T.C ecu fan temp setting is set n stone so I will be using the combo 84 n MERKUR circuit so I can lower my fans activation temp..Thank-You for replying to my ?'s. I hope to have my car on the road by April...I just ordered your 3" downpipe so I can fish getting it wired n fired n will be ordering more exhaust pieces as my budget allows. It has spark to plugs now so I figure if the rebuilt brownies are getting juice "I know they work I rebuilt them" I've got my foot in the door. This is the 1st MODERN car i.e injectors, turbo, sensors n such I've ever dealt with as I've always been a 440+6 18 spline 4.10 S60 kinna guy....THANX again !
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Post by frankensvo on Mar 28, 2022 0:03:23 GMT -5
The 87-88 TC didn't use a fan switch, the fans are computer controlled. The fan switches are not connected to the ECU. So pick one way or the other to control the fan(s), not both. Does pin 22 alternate between a + n - signal ? I'm using the MEKUR engine harness, fan harness n relay and it turns on the merkurs fan when I hot wire the relay wire "b & W" from the merkurs relay to the positive battery post.I figure I can hook the mekur wire "black n white" into ignition switch system or + battery then ground the relay wire "brown" to the temp switch "grounding switch" in the lower intake water jacket "84 GT350 T 2.3 engine" or if the #22 pin sends a + signal also, could I hook the mekurs "black n white" relay signal wire to that to close fan circuit OR should I reverse the wires n use the merkurs "brown" ground as the power wire "ign or batt" and the mekurs "black n white" wire as ground n run that to pin #22 ?....THANX! |
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Post by Stinger on Mar 30, 2022 11:30:34 GMT -5
I can't make heads or tails of all that. All I know is you can either let the Merkur temp sender control the fan (stock Merkur wiring), or you can wire it to mimic the 87-88 TC and allow the ECU to control the fan.
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Post by frankensvo on Mar 30, 2022 15:03:33 GMT -5
I can't make heads or tails of all that. All I know is you can either let the Merkur temp sender control the fan (stock Merkur wiring), or you can wire it to mimic the 87-88 TC and allow the ECU to control the fan. I'm sorry,I know it's vague I tried to keep it short n sweet....Since I sent the above post I've learned that pins #52 #55 are ground ..so in order to use it with the merkur relay I have to use the black & white merkur "+ pos" power wire that came off the w.o.t cutoff relay and run it into an ignition powered circuit or batt then run the brown ground to #52 #55.to have the ecu control it...OR just run the relay activation circuit "positive +" wire to the batt n "negative -" ground to the switch "ground at 227 degrees" in the water jacket in the lower intake and have the fan run until the coolant temp drops even if cars off or run it into ignition circuit and open circuit with key....I just didn't know if the pin's in the ecu alternated between a neg - & pos + signal ...thanx tho! |
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Post by Stinger on Mar 30, 2022 16:41:37 GMT -5
They don't alternate.
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Post by frankensvo on Mar 31, 2022 7:07:00 GMT -5
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Post by frankensvo on Apr 5, 2022 15:42:29 GMT -5
I have it wired up,I have the power coming from the the starter solenoid where all the fusible links are connected and have the merkur relay grounded with #55 pin. While key is off the fan is not running but when I turn key to run the fan starts right up with cold coolant my ? is is the #55 pin always grounded ? Should I try #52 "high drive" instead or does this mean there is possibly a short in the ecu or in my intake E.C.T.S  THANX YOU for your time, input n patience ! |
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Post by Stinger on Apr 6, 2022 10:05:20 GMT -5
Do you have wiring diagrams for these applications that shows fan relay (IRCM) configuration and such, or are you winging it?
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Post by frankensvo on Apr 7, 2022 6:54:09 GMT -5
Do you have wiring diagrams for these applications that shows fan relay (IRCM) configuration and such, or are you winging it? I have the big diagram's....1 for T.C 1 for Merkur 1 for 93 LX..I ASSumed that the T.C #55 pin that activates the multifunction relay would ground out at the preset temp and close the merkurs relay to activate the fan circuit ?....Merkur diagrahm shows the fan circuit includes A/C Temp relay then power goes thru A/C clutch W.O.T cutout relay ? |
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Post by frankensvo on Apr 7, 2022 7:18:27 GMT -5
Do you have wiring diagrams for these applications that shows fan relay (IRCM) configuration and such, or are you winging it? This is from the 84 mustang electrical vacuum t.s manual Attachment DeletedI originally planned on doing it this way..then I could change the temp "switch" to close circuit at a lower temp |
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Post by Stinger on Apr 7, 2022 9:06:04 GMT -5
It would seem like the issue is related to having too many options. If you just pick one option and wire it exactly like that, it should work.
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THANX YOU for your time, input n patience !