starter turns slow

[chevy joe]

i always thought my truck cranked over really slow but i drove another truck today and it cranked like lightning compared to my truck. i have 2 brand new batterys (napa 800cca 925ca) bought in (i think) march or april. i know my positive terminal on the second battery (passenger) is trashed. im gonna fix it with some eyelets and marine terminals. just wondering if you think this is my whole problem or if i have something else

[ianstew]

thats part of it im sure, you may also have a weak starter. that happens as well.

[STR8-6]

time for a new starter... pull an amp draw while cranking to be sure, anything over 400 is bad

[madpogue]

Batteries are a little out of their league; should be at least 850CCA. That, plus the passenger battery terminal, == weak crank. Fix it ASAP before it over-burdens the starter.

BTW, there is no "first" or "second" battery; they work in parallel. If anything, the passenger-side one is the more critical, since it's "closer" to the loads. Dunno if that means it gets more than its share of the burden on starting, GP cycle, etc.; it'd be an interesting study. Annual swap would mitigate it, I suppose...

[ianstew]

800 cca batteries are fine, but 850's are better for sure.

[alberta 7.3]

Originally Posted by madpogue

Batteries are a little out of their league; should be at least 850CCA. That, plus the passenger battery terminal, == weak crank. Fix it ASAP before it over-burdens the starter.

BTW, there is no "first" or "second" battery; they work in parallel. If anything, the passenger-side one is the more critical, since it's "closer" to the loads. Dunno if that means it gets more than its share of the burden on starting, GP cycle, etc.; it'd be an interesting study. Annual swap would mitigate it, I suppose...

Absolutely. Even though the cable to the driver side battery is another 6' or so, at higher current levels (cranking) it does create a voltage drop. If you were to boost a truck with low/dead batteries, the starter will roll over faster when the jumper cables are connected to the passenger battery.



That busted positive terminal is a disaster waiting to happen. Bad connections create heat due to resistance. That could heat the post enough to melt the battery top plastic.

[ianstew]

My truck will cycle the plugs and start on one battery. I dont see how much of a difference 100 cca between two batteries makes. Im not picking on anyone, im just saying. I do agree that the positive cable is causing issues......

[Bend6.0]

I've had Napa Batteries.... never again. My 95 started slow w/Napa's. I went to yellow top Duralast and way better, night and day. Your starter may also be going out and drawing extra amps too.