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A/C Amp Draw

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kramttocs

A/C Amp Draw

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Came across this table from a doc on the alternator page:

Heater: 12.3A. The blower relay addresses part of this.

A/C: 26A. Assuming that includes the blower it still leaves 13A.

Does that indicate that it would benefit from a relay at C616? Or am I overlooking something? I didn't think the clutch took this much.

Scott
'Camano' 1986 F250 Supercab XLT Lariat 460/C6
'Chanute' 1980 F350 C&C 400/NP 435 - Gin Pole

But there ain't nothin' wrong with the radio

Rembrant

Re: A/C Amp Draw

kramttocs wrote

I didn't think the clutch took this much.

According to my 1984 FSM, the clutch amp draw would be 4.7 amps.

Below are the amps for the blower on F150-F350 and Bronco with standard and high output heater:

I couldn't find anything specific regarding the amp draw of the AC Blower...it is slightly different isn't it? I assume it is a higher flow (thus higher amps) than the standard blower?

The only other power consumer in the AC system would be the solenoid on the carb, which might draw and amp or two?...I'm not sure. (Not present on the 460 and Diesel anyway...just the "little" engines, like mine lol).

1994 F150 4x2 Flareside. 5.0 w/MAF, 4R70W, stock.
1984 F150 4X2 Flareside. Mild 302 w/ 5spd. Sold.
1980 F150 4X4 Flareside. 300i6 w/ 5spd. Sold in 2021.
1980 F100 4X2 Flareside. 351w/2bbl w/NP435. Sold in 1995

ArdWrknTrk

Re: A/C Amp Draw

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In reply to this post by kramttocs

Do you think the clutch wire could even handle that much Scott?

And 45A just seems crazy when you make the direct comparison to a Club Wagon with the aux hot water heating.
Did those things have a fully electric driven compressor in the back?

Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.

Gary Lewis

Re: A/C Amp Draw

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In reply to this post by kramttocs

That's a good observation and a good question, Scott. I can easily check the current draw on BB's compressor clutch later today, but like you I didn't think it drew that much. Yikes!

I'll do that and let you know.

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

Gary Lewis

Re: A/C Amp Draw

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In reply to this post by Rembrant

Well, I missed Cory and Jim's replies.

Cory - The A/C blower motor is a different part number than the heater motor, but it is hard to imagine that it could pull that much more.

But back to the 26A max current draw that Scott found, I really question that since the whole circuit is fused at 30 amps. I seriously doubt that Ford would fuse something so tightly.

Gary, AKA "Gary fellow": Profile

kramttocs

Re: A/C Amp Draw

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This post was updated on .

In reply to this post by Rembrant

Thanks for this Cory!- that's the draw I was expecting.

Gary - if you get a chance to test that would be great but no rush.

Jim - regarding the wire size, no I don't, but going off of the Alternator document alone it sure doesn't look like a typo especially when you factor in the 45A footnote (which yes, is crazy) so not sure what all Ford was adding into it.

Scott
'Camano' 1986 F250 Supercab XLT Lariat 460/C6
'Chanute' 1980 F350 C&C 400/NP 435 - Gin Pole

But there ain't nothin' wrong with the radio

Rembrant

Re: A/C Amp Draw

kramttocs wrote

Thanks for this Cory!- that's the draw I was expecting.

I was guessing 3-5 amps, so I was happy to see that it was 4.67 lol. Technically, it should be a little less as I think most trucks are going to be running at a higher voltage than 12.8v aren't they?. I haven't checked my truck's old 1G 40amp alternator, but I know my cars were running more like 14.25v (I usually have an Ultragauge installed in my daily drivers).

Gary Lewis

Re: A/C Amp Draw

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The current draw on Big Blue's FS10 clutch is 3.8A with battery voltage at 12.5V:

Gary, AKA "Gary fellow": Profile

85lebaront2

Re: A/C Amp Draw

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In reply to this post by Rembrant

FWIW, my Chrysler convertible also uses a 30 amp fuse for the AC blower. Clutch is harder to determine as it is fed through a relay underhood that gets it's feed from a 40 amp maxi fuse that also powers the fan relays so with the AC on and hot conditions, it may pull near 40 amps with the cooling fans on high.

Car has what Chrysler calls a 90/140 alternator, which if I remember correctly is 90 amps continuous and 140 amps peak.

Bill AKA "LOBO" Profile

"Getting old is inevitable, growing up is optional" Darth Vader 1986 F350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator Wife's 2011 Flex Limited Daily Driver 2009 Flex Limited with factory tow package Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413

kramttocs

Re: A/C Amp Draw

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In reply to this post by Gary Lewis

Thanks Gary!

Between Cory's facts and your test, that should put it to rest.

Bill - good info. I'll need to go back and read that whole document to see if maybe I took the table out of context.

Scott
'Camano' 1986 F250 Supercab XLT Lariat 460/C6
'Chanute' 1980 F350 C&C 400/NP 435 - Gin Pole

But there ain't nothin' wrong with the radio