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68C15 · 11-09-2015, 09:27 AM

To test for parasitic draw you need to measure amps between negative cable and battery. Wait about 45-60 minutes for all modules to go to sleep (shut down). Do that and report back. I regularly see vehicles in that age group with draws in the .015-.050A range. You will NOT see this in a needle meter or test light, you must use a digital meter with the ability to test miliamps. When you key is on, each and every module is on. Modern batteries do not like that. If you plan to do this often, you may want to get a deep cycle battery

11-09-2015, 09:27 AM	#11
68C15 blood type; Retumbo Join Date: Jan 2004 Location: next to my reloading bench Posts: 10,269	Re: 2000 suburban ground issues To test for parasitic draw you need to measure amps between negative cable and battery. Wait about 45-60 minutes for all modules to go to sleep (shut down). Do that and report back. I regularly see vehicles in that age group with draws in the .015-.050A range. You will NOT see this in a needle meter or test light, you must use a digital meter with the ability to test miliamps. When you key is on, each and every module is on. Modern batteries do not like that. If you plan to do this often, you may want to get a deep cycle battery __________________ Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card