All -- item 43 on the schematics - ( yamaha book) is a 15 amp fuse -- It has most of the stuff on its cct -- from the tach - signals - gas gauge -- lights on instrument cluster etc.
This was blowing on my 86 --- obvisously there was a short to ground on a power wire somewhere and the trick is to find it. I started by disconnecting the plug on the left side and under the tank but it was none of those areas. Ultimately I had to take the right side covers - air scoop to look at the harnesses.
I had an ohm meter on ground side of the fuse box -- good should be around 180 -- when it was shorting is was 2 or 3 ohms. With the meter connected I wiggled the harness and found the harness in this area to be the culprit. Specifically a white multi plug in the lower area -- a brown wire with had the insulation off and shorting --- arch marks etc. -- corrected the wire and insulated.
So far so good ---
While this type of issue could be anywhere in the circuit -- I am posting this for others in case.
Quote from: moparman70 on March 26, 2017, 07:13:40 PM
All -- item 43 on the schematics - ( yamaha book) is a 15 amp fuse -- It has most of the stuff on its cct --- obvisously there was a short to ground on a power wire somewhere and the trick is to find it. I started by disconnecting the plug on the left side and under the tank but it was none of those areas. Ultimately I had to take the right side covers - air scoop to look at the harnesses. I had an ohm meter on ground side of the fuse box -- good should be around 180 -- when it was shorting is was 2 or 3 ohms. With the meter connected I wiggled the harness and found the harness in this area to be the culprit. Specifically a white multi plug in the lower area -- a brown wire with had the insulation off and shorting --- arch marks etc. -- corrected the wire and insulated. So far so good --- While this type of issue could be anywhere in the circuit -- I am posting this for others in case.
Moparman,
NAPA and most auto parts stores will have liquid, brush-on electrical insulation in a bottle. Two coats should do it. They also may have spiral-wrap, which protects wires from abrasion by any nearby metal parts. There is also a split-sheathing for the same job, which can be secured by tape or tie-wraps. Choose the high-temperature versions of these products, for wiring near the engine.