Re: elect prob
[Re: bonefish]
#1060940
08/24/11 11:49 AM
08/24/11 11:49 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
this is not nesasarily temp $.i have the big Be Cool rad.2 spal fans mez.55 elect pump stock housing.msd 6al and pro billit dist.my fans come on at 205 degs at idle,when they do my rpm,s drop by 400 then when it cools back to 180 and the fans shut off it jumps back up 400 rpm.i have to set my idle at 1500 when the fans come on it idles 1100,ingear 900.
Are you running a alt
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Re: elect prob
[Re: bonefish]
#1060941
08/24/11 11:53 AM
08/24/11 11:53 AM
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Joined: Dec 2009
Posts: 20,627
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,627
in a cattle trailer down by th...
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Sounds to me like those fans are pulling a lot of amperage and the alternator is dragging the idle speed down. What amperage alternator are you running and what battery? One battery or two?
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: elect prob
[Re: Guitar Jones]
#1060942
08/24/11 01:00 PM
08/24/11 01:00 PM
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Joined: Nov 2004
Posts: 7,274
s.w.fl
bonefish
OP
master
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OP
master
Joined: Nov 2004
Posts: 7,274
s.w.fl
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im runnin a little over kill on the alt its a 140 amp one wire.the gage twitches when the fans come on but goes right back to 13.75 volts. i have deep cycle marine battery,850 cc
Last edited by bonefish; 08/24/11 01:02 PM.
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Re: elect prob
[Re: bonefish]
#1060943
08/24/11 01:25 PM
08/24/11 01:25 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
im runnin a little over kill on the alt its a 140 amp one wire.the gage twitches when the fans come on but goes right back to 13.75 volts. i have deep cycle marine battery,850 cc
Your just loading down the alt enough to pull the
engine rpm down... must be some pretty heavy amps
on those fans... how many amps do they draw
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Re: elect prob
[Re: bonefish]
#1060945
08/24/11 01:40 PM
08/24/11 01:40 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Quote:
im runnin a little over kill on the alt its a 140 amp one wire.the gage twitches when the fans come on but goes right back to 13.75 volts. i have deep cycle marine battery,850 cc
Your just loading down the alt enough to pull the
engine rpm down... must be some pretty heavy amps
on those fans... how many amps do they draw
im not sure, they are spal fans i seem to recall that they are 30 amps each.this is a 496 rb with 10.8 comp and a roller cam.dont you think it could handle an alt draw.i never thought about the amp draw and the alt being the culprit but so far thats all that seems to make sense.now what to do?
Just to test unplug 1 of the fans and see if it
drops 1/2 as much... then switch the fans and see
if it does the same... you might have 1 pulling a
high draw
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Re: elect prob
[Re: MR_P_BODY]
#1060946
08/24/11 01:48 PM
08/24/11 01:48 PM
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Joined: Nov 2004
Posts: 7,274
s.w.fl
bonefish
OP
master
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OP
master
Joined: Nov 2004
Posts: 7,274
s.w.fl
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Quote:
Quote:
Quote:
Quote:
im runnin a little over kill on the alt its a 140 amp one wire.the gage twitches when the fans come on but goes right back to 13.75 volts. i have deep cycle marine battery,850 cc
Your just loading down the alt enough to pull the
engine rpm down... must be some pretty heavy amps
on those fans... how many amps do they draw
im not sure, they are spal fans i seem to recall that they are 30 amps each.this is a 496 rb with 10.8 comp and a roller cam.dont you think it could handle an alt draw.i never thought about the amp draw and the alt being the culprit but so far thats all that seems to make sense.now what to do?
Just to test unplug 1 of the fans and see if it
drops 1/2 as much... then switch the fans and see
if it does the same... you might have 1 pulling a
high draw
good idea,ill do that tomorrow and let ya know.im went to the spal web site and if i looked at the right fans they pull 20 amps each.
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Re: elect prob
[Re: bonefish]
#1060947
08/24/11 04:45 PM
08/24/11 04:45 PM
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Joined: Dec 2009
Posts: 20,627
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,627
in a cattle trailer down by th...
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40 amps should drag it down a little, sounds like you have a bad fan or maybe a poor ground causing it to draw more amps then necessary.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: elect prob
[Re: MR_P_BODY]
#1060948
08/25/11 10:43 AM
08/25/11 10:43 AM
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Joined: Nov 2004
Posts: 7,274
s.w.fl
bonefish
OP
master
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OP
master
Joined: Nov 2004
Posts: 7,274
s.w.fl
|
Quote:
Quote:
Quote:
Quote:
im runnin a little over kill on the alt its a 140 amp one wire.the gage twitches when the fans come on but goes right back to 13.75 volts. i have deep cycle marine battery,850 cc
Your just loading down the alt enough to pull the
engine rpm down... must be some pretty heavy amps
on those fans... how many amps do they draw
im not sure, they are spal fans i seem to recall that they are 30 amps each.this is a 496 rb with 10.8 comp and a roller cam.dont you think it could handle an alt draw.i never thought about the amp draw and the alt being the culprit but so far thats all that seems to make sense.now what to do?
Just to test unplug 1 of the fans and see if it
drops 1/2 as much... then switch the fans and see
if it does the same... you might have 1 pulling a
high draw
well, i did that and they each pull it down half as much,i ran the grounds straight to the frame,no diff.i wonder if having to small a carb could cause this ,mabey im gettin too weak of an idle.also if the batt is weak could it be taxing the alt enough to bog it.
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Re: elect prob
[Re: bonefish]
#1060952
08/26/11 12:51 PM
08/26/11 12:51 PM
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Joined: Aug 2003
Posts: 43,123
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,123
Bend,OR USA
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Try charging the battery with a battery charger that you can set at or below 6 amps(disconnet both battery leads first so there is no chance for any voltage drain) , charge it for two or three days and then let it sit for several hours and check the voltage. If it is above 12.25 to 12.50 the battery is okay, if it is above 12.5 up to 13.25 then the battery is probally in pretty good shape  I have two big RV/marine batterys in my car and it does not get driven a lot, the flaot voltage will stay at 12.7 or above if I turn the battery switch off when I let the car sit I have a digtal radio with memory so it draws a tiny bit of current for it  It will eventually draw the batterys down to 12.3 or so  BTW, as far as the relays I would use two seperate 30 amp relays, one for each fan  Hook them up parelel, not is series  Run two seperate battery feed wires also.
Last edited by Cab_Burge; 08/26/11 12:57 PM.
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