Author Topic: 16.5 Volts at Alternator; 13.5 at Battery  (Read 1114 times)

Offline dpcd67

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16.5 Volts at Alternator; 13.5 at Battery
« on: August 20, 2014 - 06:35:38 PM »
I have 16.5 volts coming out of the alternator and the battery is getting 13.5; problem is that it never stops; this pattern is constant; I replaced the voltage regulator today with no change.  I have not disconnected/wired up my Amp meter yet; will this help? Any advice?
I think I will modify the red/black wiring through the firewall like in the 'MAD" article. That might help.
« Last Edit: August 20, 2014 - 07:15:46 PM by dpcd67 »
1963 Dodge M37 (3)
1967 Dodge WM300 (2)
1971 Plymouth Duster
Bought new in '71; I wanted the Challenger but they were $2850; too much $ so I got the 318, 3 speed on the floor, Twister Duster for $2100.
1973 Plymouth Barracuda
I ain't done yet.




Offline dodj

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Re: 16.5 Volts at Alternator; 13.5 at Battery
« Reply #1 on: August 20, 2014 - 09:24:27 PM »
You have high resistance connections in your charging cct. you are dropping 3v over poor connections. You need to take apart connections and clean/tighten them.
Scott
1973 Challenger  440 4 spd 
2007.5 3500 6.7 Cummins Diesel, Anarchy tuned.
Good friends don't let friends do stupid things. ........alone.

Offline Strawdawg

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Re: 16.5 Volts at Alternator; 13.5 at Battery
« Reply #2 on: August 20, 2014 - 09:46:30 PM »
Yep,  bulkhead connections may be fried. Check the voltage on the red wire at the column connector. Doing the bypass will help but you need to get rid of the drop so the voltage sensing is not being fooled

Offline Chryco Psycho

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Re: 16.5 Volts at Alternator; 13.5 at Battery
« Reply #3 on: August 20, 2014 - 10:58:07 PM »
3v drop will create a lot of heat maybe the battery is damaged

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Offline dpcd67

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Re: 16.5 Volts at Alternator; 13.5 at Battery
« Reply #4 on: August 21, 2014 - 11:07:07 AM »
This is after I cleaned and greased all the connections. The red wire on the bulkhead connector was melted when I got the car and I fixed that with new connectors. The battery is new.  I figured that if I used the MAD conversion, I would eliminate all the male/female connections and thereby improve everything.
« Last Edit: August 21, 2014 - 11:12:34 AM by dpcd67 »
1963 Dodge M37 (3)
1967 Dodge WM300 (2)
1971 Plymouth Duster
Bought new in '71; I wanted the Challenger but they were $2850; too much $ so I got the 318, 3 speed on the floor, Twister Duster for $2100.
1973 Plymouth Barracuda
I ain't done yet.