This is givin me a freakin headache, whats the deal?
#773946
08/15/10 12:54 AM
08/15/10 12:54 AM
|
Joined: Sep 2003
Posts: 6,847 Missouri
StrokerPost
OP
master
|
OP
master
Joined: Sep 2003
Posts: 6,847
Missouri
|
Was rewiring a guys race car, he had no relays and no circuit protection on the fuel pump, water pump or the fan. So I give everything its own relay and circuit breaker, the only thing I did different than I've always done is instead of switching the small HOT wire, I wired it to switch the ground off the relay cuz thats what an article I read said was the proper way to do it. The only "common" connection here is the power point on the firewall, the main feed from there to the breaker and then to the relays for the the w/p and fan come off that. The main feed to the fuel pump comes off the batt. Ok, the problem I have is I turn on any one of the toggles for those components, THEY ALL COME ON!! Why is that? Again, the ground off the relays, not the hot wire, run through the toggles and then to a chassis ground. Even if I pull the ground off the toggle that goes to the chassis for 2 of the 3 circuits, EVERYTHING comes on. What gives? Is it not possible to have more than one relay on a car wired in this way? Is it in someway "backfeeding"? I'm at a loss. I used the same brand stuff I always use, just wired it a bit diff. I wanted to get some input before I went and ripped out several hours of work to wire it the way I normally do it. Thanks, Ken.
|
|
|
Re: This is givin me a freakin headache, whats the deal?
[Re: Dunnuck Racing]
#773949
08/15/10 01:26 AM
08/15/10 01:26 AM
|
Joined: Sep 2003
Posts: 6,847 Missouri
StrokerPost
OP
master
|
OP
master
Joined: Sep 2003
Posts: 6,847
Missouri
|
Quote:
My guess is they are all grounding through the mounting brackets.Try leaving them loose and see if they work,if they do,just mount them to a plastic panel.
You mean the toggles? I used lighted toggles that have plastic bodies. The 30A relays are also plastic bodied.
|
|
|
Re: This is givin me a freakin headache, whats the deal?
[Re: Twostick]
#773952
08/15/10 01:56 AM
08/15/10 01:56 AM
|
Joined: Nov 2003
Posts: 6,293 Rock Springs
Bob_Coomer
master
|
master
Joined: Nov 2003
Posts: 6,293
Rock Springs
|
is it possible that the relays are wired to a normally closed circuit, which powered they would be then open or "off"? Other than that just use your volt meter and check continuity between the ground and the relay too check to see if its already grounded?
[color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
|
|
|
Re: This is givin me a freakin headache, whats the deal?
[Re: Bob_Coomer]
#773954
08/15/10 03:06 AM
08/15/10 03:06 AM
|
Joined: Sep 2003
Posts: 6,847 Missouri
StrokerPost
OP
master
|
OP
master
Joined: Sep 2003
Posts: 6,847
Missouri
|
Quote:
is it possible that the relays are wired to a normally closed circuit, which powered they would be then open or "off"? Other than that just use your volt meter and check continuity between the ground and the relay too check to see if its already grounded?
DING, DING, DING, DING...... I think we have a winner. Just for grins I went back out and simply reversed the positions of the wires on each toggle and now everything SEEMS to be working normally. I still cannot wrap my head around why, but, for now its working. The only "problem" is that with no power lead going to the switches, the lighted switches...arent. Didnt think about that, so, its either leave it like it is, or rewire it the way I used to do it and have the lighted switches. Oh well, thanks guys for throwing some brain cells at this. Ken.
|
|
|
Re: This is givin me a freakin headache, whats the deal?
[Re: Bob_Coomer]
#773955
08/15/10 01:03 PM
08/15/10 01:03 PM
|
Joined: Jan 2003
Posts: 10,766 Central Valley, CA.
Quicksilver440
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
|
Quote:
is it possible that the relays are wired to a normally closed circuit, which powered they would be then open or "off"? Other than that just use your volt meter and check continuity between the ground and the relay too check to see if its already grounded?
Can he replace the relays with ones that are normally open "off"? And everything would work correctly? Maybe I don't understand his setup....
|
|
|
Re: This is givin me a freakin headache, whats the deal?
[Re: jamesc]
#773957
08/15/10 09:50 PM
08/15/10 09:50 PM
|
Joined: Nov 2004
Posts: 4,330 Lynchburg, VA
Leon441
master
|
master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
|
Without seeing a schematic of the lighted switches can't say for absolute sure. But, I will bet the problem is in the switch panel. Just take the wire off the switch and ground it. This way there is nothing to backfeed. If 12 volts from the light portion of the switch goes to the coil on the relay you meant to ground to activate you now have 12v on each side of the coil. No potential difference, I MEAN VOLTAGE.
Leon
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
|
|
|
Re: This is givin me a freakin headache, whats the deal?
[Re: HEMIFRED]
#773958
08/15/10 10:58 PM
08/15/10 10:58 PM
|
Joined: Dec 2004
Posts: 625 Florida-West Coast
Thor500
mopar
|
mopar
Joined: Dec 2004
Posts: 625
Florida-West Coast
|
Quote:
a race car should only have one relay on the fuel pump. with relays too many wires too many things to go wrong. a good switch, correct wire size and a fuse are all you need
I agree
|
|
|
|
|