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Mar 31, 2020 | 03:11 PM

TPI BOY

Thread Starter

Burning Brakes

Joined: Dec 2002

Posts: 1,179

Likes: 3

From: STANTON CA

Starting

Can you start your car with the battery tender still connected
still charging

Mar 31, 2020 | 03:36 PM

Easy Mike

Team Owner

Joined: Jun 2000

Posts: 38,923

Likes: 1,481

From: Southbound

Cruise-In II Veteran

I'm not sure I would. What do the instructions of the tender say?

Mar 31, 2020 | 03:39 PM

TPI BOY

Thread Starter

Burning Brakes

Joined: Dec 2002

Posts: 1,179

Likes: 3

From: STANTON CA

Mike lost them years ago

Mar 31, 2020 | 03:46 PM

dragonist2

Instructor

Joined: Jul 2011

Posts: 111

Likes: 12

From: New Jersey

I don't see how it would be any different than starting with jump cables attached. I wouldn't think it would damage the car. It could maybe confuse the battery tender but unsure if it would cause damage.

Mar 31, 2020 | 04:00 PM

HeadsU.P.

Le Mans Master

Joined: Aug 2017

Posts: 8,336

Likes: 2,810

From: Cool Northern Michigan

Yes you can. Is it good for the Tender? Likely not, because its getting a extra shot of 12 V from an outside source, the ALT.
If I remember, I disconnect the GRD alligator clip before starting the vehicle.

Apr 1, 2020 | 04:50 PM

Aquarian

Melting Slicks

Joined: Aug 2013

Posts: 2,180

Likes: 107

From: S Fla

I believe my battery tender instructions say to unplug and disconnect before starting, but those are trickle chargers.

Apr 1, 2020 | 06:16 PM

derekderek

Race Director

Joined: Jul 2015

Posts: 13,082

Likes: 3,399

From: SW Florida.

any charger, upon seeing 13.5 or whatever will stop or greatly reduce charge level. any charger except a digital schumacher that i have disconnected the blown out digital part on...