Amperage Rating Difference Between Roadmaster RM-790 and RM-690

Question

Question:

Can I use a 790 hy power diode series in place of the 690 application cant find the spec on the 790? I want to put the 790 between the vehicle 12v battery13.5v charging supply and the caravan 12v battery to stop feed back and protect the vehicle batterys. I have access to a 790. limited access for supply of 690 diodes.

asked by: Colin G

0

Expert Reply:

The # RM-690 has a 85 amp capacity and the # RM-790 also has an 85 amp capacity. For preventing backfeed on a circuit either diode will work just fine as long as the amperage of your setup stays under the rating for either diode.

The biggest advantage the # RM-790 has other than the higher capacity is that it can be used with two different inputs.

expert reply by: Jameson C

0

Answer 1

Diodes like the part #RM-790 only allow current to flow in one direction. Usually a diode is a small cylindrical shaped component (not in this case) which has two leads on it, the anode and the cathode. When the anode side of the diode is facing…

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Answer 2

When wiring a trailer connector, it is best to wire by function, as wire colors can vary. We have an excellent wiring diagram on our website, I will provide you a link so you can look at it. If you are looking at the inside of the trailer connector…

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Answer 3

The only black exterior ladder we offer at this time is the Stromberg Carlson RV Exterior Ladder part #LA-401BA which is 99-1/2" tall but can be trimmed down if needed. When replacing the exterior ladder that you have now you will want to…

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Answer 4

I do have some technical information for you about the Roadmaster Diodes #RM-690 and #RM-790, but I do not have any prints available. Both part numbers are 1/2" tall, 1-9/16" wide, and are 1-5/16" long. They can withstand up to 85 of…

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Answer 5

Typically people will let the breakaway battery run the breakaway system and then would use the accessory battery to power the interior lights etc. This tends to work the best since your breakaway battery needs to always be charged and interior…

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Answer 6

Your black drawing would be how wire up the #RM-790 so that both batteries would be on the same circuit but with feedback prevented on the circuits back to the batteries or having them tied together. Basically you would use a diode on each battery…

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Answer 7

The diode part #RM-790 that you referenced does exactly what you are looking to do. It takes two power sources and can combine them onto one wire and prevents backfeeding from either circuit. So for what you need this would work well.

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Answer 8

If you ran a jumper wire from a 12 volt battery to the input side of the Roadmaster Hy-Power Diode #RM-790 and then used a circuit tester like part #PTW2993 to test the output pin for 12 volts you'd know if the diode was good or not.

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Answer 9

Diodes like the Roadmaster Hy-Power Diode #RM-790 can be used for a wide variety of applications! If your LED headlights are going to be receiving power from 2 sources then use the part #RM-790 that you referenced. If they will only be receiving…

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Answer 10

I spoke with my contact at RoadMaster and the maximum voltage of the Roadmaster Hy-Power Diode, item #RM-790, is 24 volts. The maximum amperage is 85 amps. These are silicon resistors.

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Answer 11

I spoke to my contact at Roadmaster and he said that the diode part #RM-790 would have a very minimal amount of resistance. He said that as long as you install the diode properly there would be no way it would generate any trailer light error codes…

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Answer 12

I spoke with my contact at Roadmaster regarding the issue you mentioned when using the InvisiBrake Braking System #RM-8700 on your 2018 Ford Edge. He stated that the potential for the brake circuit on the vehicle to backfeed into the InvisiBrake…

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