if your running a stock 55 amp-88 amp alternator its very likely that the addition of several electrical cooling fans could and more than likely would drain considerable current from the system, most cooling fans will run at several speeds(RPM RANGES) and a 14" fan is very likely to pull well over 15-20 amps on initial start up, so the typical OEM alternator on a 1970 el Camino will be seriously over loaded if both fans turn on, making use of relays, heavier gauge wire, and a larger capacity alternator mandatory
reading these links might help
swapping to a 150 amp alternator might be the quick solution especially if you wire the fans with relays correctly
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Measuring Amps
Hello; Ben away for a bit but back at it again. I purchased a (crappy/cheap) serpentine kit for my 57 chevy. Included was a bright new alternator which came with the wrong pulley (v Belt) but supplied in the kit was a serpentine pulley. When I went to the alternator shop (yeah I got one near my...
garage.grumpysperformance.com
Good alternator putting out low voltage
I learned decades ago to swap to a 140 amp-200 amp alternator, as the stock 75-105 amp alternators on muscle cars and earlier corvettes are marginal at best/ if you shop carefully they can usually be found locally at some alternator re-builders for under $150 both my corvettes have 200 amp...
garage.grumpysperformance.com
tracking down the problem getting the engine started
If your car won,t start consistently, you need to isolate the problem to the source, you can,t isolate the cause without understanding the process, so you may as well start looking into how and why each step in the process starts , and how each step functions and triggers the next step. your...
garage.grumpysperformance.com
tracking down an electrical drain
one of the more common problems I see in older muscle cars and corvettes is that, many of the guys that own those cars, have the cars used rather intermittently or only on weekends, not as daily transportation, and as a result when they do go to use the car the battery's dead. this is almost...
garage.grumpysperformance.com
Suspicious voltage drop...
What do you guys think? My alt is a 55Amp Bosch. At idle I get 13.6 V If I turns the headlights on, the voltage drops to 12.6 V Something tells me that's prob not normal. Correct?
garage.grumpysperformance.com
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