Measuring amps/watts.

Eric2.0

Registered Member
I have a multimeter.

What is the best way to determine the amp draw/wattage of a light bar such as a Federal Vista?

I'm guessing measuring the current as the light is on.
 

Jarred J.

Archive Expert
Silver Supporter
 

shues

Lifetime VIP Supporter
Your multimeter is probably only capable of a maximum of 10 amps DC, and is probably fused at 11 amps. You could measure the amp draw of each component individually, if you're careful, and add them up. If you want an exact number for the entire bar at once, look for a clamp style ammeter that's capable of 100 amps DC or better.
 
OP
OP
E

Eric2.0

Registered Member
Your multimeter is probably only capable of a maximum of 10 amps DC, and is probably fused at 11 amps. You could measure the amp draw of each component individually, if you're careful, and add them up. If you want an exact number for the entire bar at once, look for a clamp style ammeter that's capable of 100 amps DC or better.
Good information, thanks.
 

Jennifer Rose Towing

Site Regular
Keep in mind the amp draw will be different between 12 and 14volts. If you are using a power supply, many are not designed to be run at peak amps for very long. IIRC in general 80% capacity is a good rule.
 
OP
OP
E

Eric2.0

Registered Member
Keep in mind the amp draw will be different between 12 and 14volts. If you are using a power supply, many are not designed to be run at peak amps for very long. IIRC in general 80% capacity is a good rule.
No power supply. I guess I'm coming off the battery, to my control head and then to the light bar, using a breaker for the main leads. I think that is the way to do it. If there is a better way I'm all ears.
My setup will be a Federal JetStrobe or Vista with some grill flashers and rear tailight strobes in the reverse lights. I'm setting my truck up for pushing race cars at our race track this summer....if we ever get to race due to the pandemic situation
 

jmamrak

Established Member
I use an inductive DC amp clamp. Make sure if you use one that it’s DC compatible. Not all are. Mine is from amazon and converts amps to milivolts. @shues is correct. I use mine for many things including proper fusing, calling bad starters, and many more.
 

Online statistics

Members online
15
Guests online
170
Total visitors
185

Forum statistics

Threads
48,298
Messages
422,231
Unanswered questions
8
Members
17,380
Latest member
ctilley
Top Bottom