Starter check

[pinetum]

Does anyone know what the resistance reading should be from the starter cable connection to ground. My friend's '82 Yamaha has 0.2 ohms. This seems low to me. Can not find any info on reading in service manual.

 

Frank

[dingy]

I have two good spare starters I can check tonight and see what they read.

You are looking for resistance from positive input on starter to case ground?

Gary

[pinetum]

Thanks Dingy. Yes, that's the reading I need.

Frank

[Flyinfool]

Just looking at it mathematically.

The formula for amps is volts ÷ resistance. So 12V ÷ 0.2Ω = 60 Amps. That sounds about right for starter current.

[dingy]

Thanks Dingy. Yes, that's the reading I need.

Frank

 

Checked both starters.

 

1st with a Simpson 260 analog meter and both were .25 ohms on average, reading went up a little as brushes crossed commuter.

 

2nd with a Beckman 310 digital meter and both were .3 ohms on average.

 

I trust the Simpson a little more for low readings like this. Since it is analog, I know it is right at zero when I start and scale has more definition than the digital. Digital only displays one decimal point accuracy.

 

Gary

[pinetum]

Thanks guys for the info. Looks like his starter is OK.

 

Frank