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Charging system Upgrade on 71 Challenger
#146610
11/06/08 10:09 PM
11/06/08 10:09 PM
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Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
MoparDonny
OP
top fuel
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OP
top fuel
Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
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Any ideas what would be a good way to upgrade this old system? Not having any problems but I don't think it is a very strong charging system in these old cars. Even when I hit the brakes I can hear the fuel pump change pitch dramatically and, I won't even get into the turn signal effect on the fuel pump  Just thinking there must be an easy upgrade......or is it that simple?? Don.
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Re: Charging system Upgrade on 71 Challenger
[Re: MoparDonny]
#146614
11/07/08 04:39 PM
11/07/08 04:39 PM
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Joined: Apr 2007
Posts: 2,826
NY usa
540challenger
master
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master
Joined: Apr 2007
Posts: 2,826
NY usa
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Quote:
Any ideas what would be a good way to upgrade this old system? Not having any problems but I don't think it is a very strong charging system in these old cars. Even when I hit the brakes I can hear the fuel pump change pitch dramatically and, I won't even get into the turn signal effect on the fuel pump
Don.
Just thinking there must be an easy upgrade......or is it that simple??
I had the same problem with my challenger.
I got a later model high amp out of a pick-up late 70"s i think.
I brought a reman version using the late truck appication. found a 80 amp and installed i also installed a volt meter.
At idle i found that iwas dropping to around 12.8-13.2 volts.
My idle speed was aroudn 700-750 rpms
Well my alternator went bad and i went to a local rebulder was charged $125 for the rebuild ever since at idle i now charge at 14.-14.5 at the same idle speed.
i have an aftermarket cd deck installed along with digital guages, even at night with my headlights on my voltage doesn't drop.
I befroe the rebuild at stops at night i could see the lights dim i step on the break he volts would go lower and lower.
i think the problem lies in old worn parts and carppy rebuilds cheap units sold at the local parts store.
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Re: Charging system Upgrade on 71 Challenger
[Re: RapidRobert]
#146616
11/08/08 12:19 AM
11/08/08 12:19 AM
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Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
MoparDonny
OP
top fuel
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OP
top fuel
Joined: Nov 2004
Posts: 1,760
Port Alberni, British Columbia
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Quote:
Quote:
I Add a 2nd output lead (8 gauge) from the alternator output stud to the starter relay stud or battery. Doug
that'd be the simplist/fastest way plus cleaning all connections might be enough of an upgrade to take care of you.
So..........  ...........After reading some of the links to older posts and seeing the diagrams posted by Nacho, it would seem that running a wire from the batt(start Relay post) to the Amm, and another from the Alt post to the Charge side of the Amm (both new wires through a separate grommet in the firewall) would take ALOT of load and potential heat away from the bulkhead connector. Am I right on this? Would this setup be easily converted to a Voltmeter setup later if I decide to change my gauges?
AND....... I have my fuel pump power comming from the start relay post to an oil pressure switch on back of engine, then straight to the pump from there. Not a good idea? 
Don.
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Re: Charging system Upgrade on 71 Challenger
[Re: MoparDonny]
#146617
11/08/08 12:41 AM
11/08/08 12:41 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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running the 2 wires in thru 2 grommets takes the load off of the problem bulkhead as Nacho says & keeps the ammeter functional. running a jumper from the alt to the starter relay is easier & renders the ammeter inaccurate & a voltmeter should be added. there's obviously more to this than the above & I am just getting started on this myself. feeding the gauge off the starter relay batt stud is OK if you have it fused .
live every 24 hour block of time like it's your last day on earth
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